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Phenomenon of US political rhetoric after WWII
the events during the cold war

McCarthyism, also known as the Second Red Scare, was the political repression and persecution of left wing individuals and a campaign spreading fear of alleged communist and Soviet influence on American institutions and of Soviet espionage in the United States during the late 1940s through the 1950s. After the mid 1950s, U. S. Senator Joseph McCarthy, who had spearheaded the campaign, gradually lost his public popularity and credibility after several of his accusations were found to be false. The U. S. Supreme Court under Chief Justice Earl Warren made a series of rulings on civil and political rights that overturned several key laws and legislative directives, and helped bring an end to the Second Red Scare. Historians have suggested since the 1980s that as McCarthy's involvement was less central than that of others, a different and more accurate term should be used instead that more accurately conveys the breadth of the phenomenon, and that the term McCarthyism is, in the modern day, outdated. Ellen Schrecker has suggested that Hooverism, after FBI Head J. Edgar Hoover, is more appropriate. What became known as the McCarthy era began before McCarthy's rise to national fame. Following the breakdown of the wartime East West alliance with the Soviet Union, and with many remembering the First Red Scare, President Harry S. Truman signed an executive order in 1947 to screen federal employees for possible association with organizations deemed "totalitarian, fascist, communist, or subversive", or advocating "to alter the form of Government of the United States by unconstitutional means." The following year, the Czechoslovak coup by the Communist Party of Czechoslovakia heightened concern in the West about Communist parties seizing power and the possibility of subversion. In 1949, a high level State Department official was convicted of perjury in a case of espionage, and the Soviet Union tested a nuclear bomb. The Korean War started the next year, significantly raising tensions and fears of impending communist upheavals in the United States. In a speech in February 1950, McCarthy claimed to have a list of members of the Communist Party USA working in the State Department, which attracted substantial press attention, and the term McCarthyism was published for the first time in late March of that year in The Christian Science Monitor, along with a political cartoon by Herblock in The Washington Post. The term has since taken on a broader meaning, describing the excesses of similar efforts to crack down on alleged "subversive" elements. In the early 21st century, the term is used more generally to describe reckless and unsubstantiated accusations of treason and far left extremism, along with demagogic personal attacks on the character and patriotism of political adversaries. The primary targets for persecution were government employees, prominent figures in the entertainment industry, academics, left wing politicians, and labor union activists. Suspicions were often given credence despite inconclusive and questionable evidence, and the level of threat posed by a person's real or supposed leftist associations and beliefs were often exaggerated. Many people suffered loss of employment and the destruction of their careers and livelihoods as a result of the crackdowns on suspected communists, and some were outright imprisoned. Most of these reprisals were initiated by trial verdicts that were later overturned, laws that were later struck down as unconstitutional, dismissals for reasons later declared illegal or actionable, and extra judiciary procedures, such as informal blacklists by employers and public institutions, that would come into general disrepute, though by then many lives had been ruined. The most notable examples of McCarthyism include the investigations of alleged communists that were conducted by Senator McCarthy, and the hearings conducted by the House Un American Activities Committee (HUAC). Following the end of the Cold War, unearthed documents revealed substantial Soviet spy activity in the United States, though many of the agents were never properly identified by Senator McCarthy.

President Harry S. Truman's Executive Order 9835 of March 21, 1947, required that all federal civil service employees be screened for "loyalty". The order said that one basis for determining disloyalty would be a finding of "membership in, affiliation with or sympathetic association" with any organization determined by the attorney general to be "totalitarian, fascist, communist or subversive" or advocating or approving the forceful denial of constitutional rights to other persons or seeking "to alter the form of Government of the United States by unconstitutional means". The historical period that came to be known as the McCarthy era began well before Joseph McCarthy's own involvement in it. Many factors contributed to McCarthyism, some of them with roots in the First Red Scare (1917–20), inspired by communism's emergence as a recognized political force and widespread social disruption in the United States related to unionizing and anarchist activities. Owing in part to its success in organizing labor unions and its early opposition to fascism, and offering an alternative to the ills of capitalism during the Great Depression, the Communist Party of the United States increased its membership through the 1930s, reaching a peak of about 75,000 members in 1940–41. While the United States was engaged in World War II and allied with the Soviet Union, the issue of anti communism was largely muted. With the end of World War II, the Cold War began almost immediately, as the Soviet Union installed communist puppet régimes in areas it had occupied across Central and Eastern Europe. In a March 1947 address to Congress, Truman enunciated a new foreign policy doctrine that committed the United States to opposing Soviet geopolitical expansion. This doctrine came to be known as the Truman Doctrine, and it guided United States support for anti communist forces in Greece and later in China and elsewhere. Although the Igor Gouzenko and Elizabeth Bentley affairs had raised the issue of Soviet espionage in 1945, events in 1949 and 1950 sharply increased the sense of threat in the United States related to communism. The Soviet Union tested an atomic bomb in 1949, earlier than many analysts had expected, raising the stakes in the Cold War. That same year, Mao Zedong's communist army gained control of mainland China despite heavy American financial support of the opposing Kuomintang. In 1950, the Korean War began, pitting U. S., U. N., and South Korean forces against communists from North Korea and China. During the following year, evidence of increased sophistication in Soviet Cold War espionage activities was found in the West. In January 1950, Alger Hiss, a high level State Department official, was convicted of perjury. Hiss was in effect found guilty of espionage; the statute of limitations had run out for that crime, but he was convicted of having perjured himself when he denied that charge in earlier testimony before the HUAC. In Britain, Klaus Fuchs confessed to committing espionage on behalf of the Soviet Union while working on the Manhattan Project at Los Alamos National Laboratory during the War. Julius and Ethel Rosenberg were arrested in 1950 in the United States on charges of stealing atomic bomb secrets for the Soviets, and were executed in 1953. Other forces encouraged the rise of McCarthyism. The more conservative politicians in the United States had historically referred to progressive reforms, such as child labor laws and women's suffrage, as "communist" or "Red plots", trying to raise fears against such changes. They used similar terms during the 1930s and the Great Depression when opposing the New Deal policies of President Franklin D. Roosevelt. Many conservatives equated the New Deal with socialism or Communism, and thought the policies were evidence of too much influence by allegedly communist policy makers in the Roosevelt administration. In general, the vaguely defined danger of "Communist influence" was a more common theme in the rhetoric of anti communist politicians than was espionage or any other specific activity. McCarthy's involvement in these issues began publicly with a speech he made on Lincoln Day, February 9, 1950, to the Republican Women's Club of Wheeling, West Virginia. He brandished a piece of paper, which he claimed contained a list of known communists working for the State Department. McCarthy is usually quoted as saying: "I have here in my hand a list of 205—a list of names that were made known to the Secretary of State as being members of the Communist Party and who nevertheless are still working and shaping policy in the State Department." This speech resulted in a flood of press attention to McCarthy and helped establish his path to becoming one of the most recognized politicians in the United States. The first recorded use of the term "McCarthyism" was in the Christian Science Monitor on March 28, 1950 ("Their little spree with McCarthyism is no aid to consultation"). The paper became one of the earliest and most consistent critics of the Senator. The next recorded use happened on the following day, in a political cartoon by Washington Post editorial cartoonist Herbert Block (Herblock). The cartoon depicts four leading Republicans trying to push an elephant (the traditional symbol of the Republican Party) to stand on a platform atop a teetering stack of ten tar buckets, the topmost of which is labeled "McCarthyism". Block later wrote: "Nothing [was] particularly ingenious about the term, which is simply used to represent a national affliction that can hardly be described in any other way. If anyone has a prior claim on it, he's welcome to the word and to the junior senator from Wisconsin along with it. I will also throw in a set of free dishes and a case of soap."

A number of anti communist committees, panels, and "loyalty review boards" in federal, state, and local governments, as well as many private agencies, carried out investigations for small and large companies concerned about possible Communists in their work forces. In Congress, the primary bodies that investigated Communist activities were the HUAC, the Senate Internal Security Subcommittee, and the Senate Permanent Subcommittee on Investigations. Between 1949 and 1954, a total of 109 investigations were carried out by these and other committees of Congress. On December 2, 1954, the United States Senate voted 67 to 22 to condemn McCarthy for "conduct that tends to bring the Senate into dishonor and disrepute".

In the federal government, President Truman's Executive Order 9835 initiated a program of loyalty reviews for federal employees in 1947. It called for dismissal if there were "reasonable grounds  for belief that the person involved is disloyal to the Government of the United States." Truman, a Democrat, was probably reacting in part to the Republican sweep in the 1946 Congressional election and felt a need to counter growing criticism from conservatives and anti communists. When President Dwight Eisenhower took office in 1953, he strengthened and extended Truman's loyalty review program, while decreasing the avenues of appeal available to dismissed employees. Hiram Bingham, chairman of the Civil Service Commission Loyalty Review Board, referred to the new rules he was obliged to enforce as "just not the American way of doing things." The following year, J. Robert Oppenheimer, scientific director of the Manhattan Project that built the first atomic bomb, then working as a consultant to the Atomic Energy Commission, was stripped of his security clearance after a four week hearing. Oppenheimer had received a top secret clearance in 1947, but was denied clearance in the harsher climate of 1954. Similar loyalty reviews were established in many state and local government offices and some private industries across the nation. In 1958, an estimated one of every five employees in the United States was required to pass some sort of loyalty review. Once a person lost a job due to an unfavorable loyalty review, finding other employment could be very difficult. "A man is ruined everywhere and forever," in the words of the chairman of President Truman's Loyalty Review Board. "No responsible employer would be likely to take a chance in giving him a job." The Department of Justice started keeping a list of organizations that it deemed subversive beginning in 1942. This list was first made public in 1948, when it included 78 groups. At its longest, it comprised 154 organizations, 110 of them identified as Communist. In the context of a loyalty review, membership in a listed organization was meant to raise a question, but not to be considered proof of disloyalty. One of the most common causes of suspicion was membership in the Washington Bookshop Association, a left leaning organization that offered lectures on literature, classical music concerts, and discounts on books.

FBI director J. Edgar Hoover designed President Truman's loyalty security program, and its background investigations of employees were carried out by FBI agents. This was a major assignment that led to the number of agents in the bureau being increased from 3,559 in 1946 to 7,029 in 1952. Hoover's sense of the communist threat and the standards of evidence applied by his bureau resulted in thousands of government workers losing their jobs. Due to Hoover's insistence upon keeping the identity of his informers secret, most subjects of loyalty security reviews were not allowed to cross examine or know the identities of those who accused them. In many cases, they were not even told of what they were accused. Hoover's influence extended beyond federal government employees and beyond the loyalty security programs. The records of loyalty review hearings and investigations were supposed to be confidential, but Hoover routinely gave evidence from them to congressional committees such as HUAC. From 1951 to 1955, the FBI operated a secret "Responsibilities Program" that distributed anonymous documents with evidence from FBI files of communist affiliations on the part of teachers, lawyers, and others. Many people accused in these "blind memoranda" were fired without any further process. The FBI engaged in a number of illegal practices in its pursuit of information on communists, including burglaries, opening mail, and illegal wiretaps. The members of the left wing National Lawyers Guild (NLG) were among the few attorneys who were willing to defend clients in communist related cases, and this made the NLG a particular target of Hoover's; the office of the NLG was burgled by the FBI at least 14 times between 1947 and 1951. Among other purposes, the FBI used its illegally obtained information to alert prosecuting attorneys about the planned legal strategies of NLG defense lawyers. The FBI also used illegal undercover operations to disrupt communist and other dissident political groups. In 1956, Hoover was becoming increasingly frustrated by Supreme Court decisions that limited the Justice Department's ability to prosecute communists. At this time, he formalized a covert "dirty tricks" program under the name COINTELPRO.

In March 1950, McCarthy had initiated a series of investigations into potential infiltration of the Central Intelligence Agency (CIA) by communist agents and came up with a list of security risks that matched one previously compiled by the Agency itself. At the request of CIA director Allen Dulles, President Eisenhower demanded that McCarthy discontinue issuing subpoenas against the CIA. Documents made public in 2004 revealed that the CIA, under Dulles' orders, had broken into McCarthy's Senate office and fed disinformation to him in order to discredit him and stop his investigation from proceeding any further.

The House Committee on Un American Activities (commonly referred to as the HUAC) was the most prominent and active government committee involved in anti communist investigations. Formed in 1938 and known as the Dies Committee, named for Rep. Martin Dies, who chaired it until 1944, HUAC investigated a variety of "activities", including those of German American Nazis during World War II. The committee soon focused on communism, beginning with an investigation into communists in the Federal Theatre Project in 1938. A significant step for HUAC was its investigation of the charges of espionage brought against Alger Hiss in 1948. This investigation ultimately resulted in Hiss's trial and conviction for perjury, and convinced many of the usefulness of congressional committees for uncovering communist subversion. HUAC achieved its greatest fame and notoriety with its investigation into the Hollywood film industry. In October 1947, the committee began to subpoena screenwriters, directors, and other movie industry professionals to testify about their known or suspected membership in the Communist Party, association with its members, or support of its beliefs. At these testimonies, this question was asked: "Are you now or have you ever been a member of the Communist Party of the United States?" Among the first film industry witnesses subpoenaed by the committee were ten who decided not to cooperate. These men, who became known as the "Hollywood Ten", cited the First Amendment's guarantee of free speech and free assembly, which they believed legally protected them from being required to answer the committee's questions. This tactic failed, and the ten were sentenced to prison for contempt of Congress. Two of them were sentenced to six months, the rest to a year. In the future, witnesses (in the entertainment industries and otherwise) who were determined not to cooperate with the committee would claim their Fifth Amendment protection against self incrimination. William Grooper and Rockwell Kent, the only two visual artists to be questioned by McCarthy, both took this approach, and emerged relatively unscathed by the experience. However, while this usually protected witnesses from a contempt of Congress citation, it was considered grounds for dismissal by many government and private industry employers. The legal requirements for Fifth Amendment protection were such that a person could not testify about his own association with the Communist Party and then refuse to "name names" of colleagues with communist affiliations. Thus, many faced a choice between "crawl[ing] through the mud to be an informer," as actor Larry Parks put it, or becoming known as a "Fifth Amendment Communist"—an epithet often used by Senator McCarthy.

In the Senate, the primary committee for investigating communists was the Senate Internal Security Subcommittee (SISS), formed in 1950 and charged with ensuring the enforcement of laws relating to "espionage, sabotage, and the protection of the internal security of the United States". The SISS was headed by Democrat Pat McCarran and gained a reputation for careful and extensive investigations. This committee spent a year investigating Owen Lattimore and other members of the Institute of Pacific Relations. As had been done numerous times before, the collection of scholars and diplomats associated with Lattimore (the so called China Hands) were accused of "losing China", and while some evidence of pro communist attitudes was found, nothing supported McCarran's accusation that Lattimore was "a conscious and articulate instrument of the Soviet conspiracy". Lattimore was charged with perjuring himself before the SISS in 1952. After many of the charges were rejected by a federal judge and one of the witnesses confessed to perjury, the case was dropped in 1955. McCarthy headed the Senate Permanent Subcommittee on Investigations in 1953 and 1954, and during that time, used it for a number of his communist hunting investigations. McCarthy first examined allegations of communist influence in the Voice of America, and then turned to the overseas library program of the State Department. Card catalogs of these libraries were searched for works by authors McCarthy deemed inappropriate. McCarthy then recited the list of supposedly pro communist authors before his subcommittee and the press. Yielding to the pressure, the State Department ordered its overseas librarians to remove from their shelves "material by any controversial persons, Communists, fellow travelers, etc." Some libraries actually burned the newly forbidden books. Though he did not block the State Department from carrying out this order, President Eisenhower publicly criticized the initiative as well, telling the graduating class of Dartmouth College President in 1953: "Don't join the book burners! Don't be afraid to go to the library and read every book so long as that document does not offend our own ideas of decency—that should be the only censorship." The president then settled for a compromise by retaining the ban on Communist books written by Communists, while also allowing the libraries to keep books on Communism written by anti Communists. McCarthy's committee then began an investigation into the United States Army. This began at the Army Signal Corps laboratory at Fort Monmouth. McCarthy garnered some headlines with stories of a dangerous spy ring among the Army researchers, but ultimately nothing came of this investigation. McCarthy next turned his attention to the case of a U. S. Army dentist who had been promoted to the rank of major despite having refused to answer questions on an Army loyalty review form. McCarthy's handling of this investigation, including a series of insults directed at a brigadier general, led to the Army–McCarthy hearings, with the Army and McCarthy trading charges and counter charges for 36 days before a nationwide television audience. While the official outcome of the hearings was inconclusive, this exposure of McCarthy to the American public resulted in a sharp decline in his popularity. In less than a year, McCarthy was censured by the Senate, and his position as a prominent force in anti communism was essentially ended.

On November 25, 1947, the day after the House of Representatives approved citations of contempt for the Hollywood Ten, Eric Johnston, president of the Motion Picture Association of America, issued a press release on behalf of the heads of the major studios that came to be referred to as the Waldorf Statement. This statement announced the firing of the Hollywood Ten and stated: "We will not knowingly employ a Communist or a member of any party or group which advocates the overthrow of the government of the United States " This marked the beginning of the Hollywood blacklist. In spite of the fact that hundreds were denied employment, the studios, producers, and other employers did not publicly admit that a blacklist existed. At this time, private loyalty review boards and anti communist investigators began to appear to fill a growing demand among certain industries to certify that their employees were above reproach. Companies that were concerned about the sensitivity of their business, or which, like the entertainment industry, felt particularly vulnerable to public opinion, made use of these private services. For a fee, these teams investigated employees and questioned them about their politics and affiliations. At such hearings, the subject usually did not have a right to the presence of an attorney, and as with HUAC, the interviewee might be asked to defend himself against accusations without being allowed to cross examine the accuser. These agencies kept cross referenced lists of leftist organizations, publications, rallies, charities, and the like, as well as lists of individuals who were known or suspected communists. Books such as Red Channels and newsletters such as Counterattack and Confidential Information were published to keep track of communist and leftist organizations and individuals. Insofar as the various blacklists of McCarthyism were actual physical lists, they were created and maintained by these private organizations.

Efforts to protect the United States from the perceived threat of communist subversion were particularly enabled by several federal laws. The Hatch Act of 1939 banned membership in subversive organizations, which was interpreted as being anti labor legislation. The Hatch Act would allow for the reduction of influence of the Workers' Alliance, which was claimed to have been created by the Soviet Union based on a model of their unemployed councils. In 1951, 23 other leaders of the party were indicted, including Elizabeth Gurley Flynn, a founding member of the American Civil Liberties Union. Many were convicted on the basis of testimony that was later admitted to be false. By 1957, 140 leaders and members of the Communist Party had been charged under the law, of whom 93 were convicted. The McCarran Internal Security Act, which became law in 1950, has been described by scholar Ellen Schrecker as "the McCarthy era's only important piece of legislation" (the Smith Act technically antedated McCarthyism). However, the McCarran Act had no real effect beyond legal harassment. It required the registration of Communist organizations with the U. S. Attorney General and established the Subversive Activities Control Board to investigate possible communist action and communist front organizations so they could be required to register. Due to numerous hearings, delays, and appeals, the act was never enforced, even with regard to the Communist Party of the United States itself, and the major provisions of the act were found to be unconstitutional in 1965 and 1967. In 1952, the Immigration and Nationality, or McCarran–Walter, Act was passed. This law allowed the government to deport immigrants or naturalized citizens engaged in subversive activities and also to bar suspected subversives from entering the country. The Communist Control Act of 1954 was passed with overwhelming support in both houses of Congress after very little debate. Jointly drafted by Republican John Marshall Butler and Democrat Hubert Humphrey, the law was an extension of the Internal Security Act of 1950, and sought to outlaw the Communist Party by declaring that the party, as well as "Communist Infiltrated Organizations" were "not entitled to any of the rights, privileges, and immunities attendant upon legal bodies." While the Communist Control Act had an odd mix of liberals and conservatives among its supporters, it never had any significant effect. The act was successfully applied only twice. In 1954 it was used to prevent Communist Party members from appearing on the New Jersey state ballot, and in 1960, it was cited to deny the CPUSA recognition as an employer under New York state's unemployment compensation system. The New York Post called the act "a monstrosity", "a wretched repudiation of democratic principles," while The Nation accused Democratic liberals of a "neurotic, election year anxiety to escape the charge of being 'soft on Communism' even at the expense of sacrificing constitutional rights."

In addition to the federal laws and responding to the worries of the local opinion, several states enacted anti communist statutes. By 1952, several states had enacted statutes against criminal anarchy, criminal syndicalism, and sedition; banned communists and "subversives" from public employment, or even from receiving public aid; demanded on loyalty oaths from public servants; and severely restricted or banned the Communist Party. In addition, six states had equivalents to the HUAC. The California Senate Factfinding Subcommittee on Un American Activities and the Florida Legislative Investigation Committee were established by their respective legislatures. Some of these states had very severe, or even extreme, laws against communism. In 1950, Michigan enacted life imprisonment for subversive propaganda; the following year, Tennessee enacted the death penalty for advocating the violent overthrow of the government. Municipalities and counties also enacted anti communist ordinances: Los Angeles banned any communist or "Muscovite model of police state dictatorship" from owning arms, while Birmingham, Alabama and Jacksonville, Florida banned any communist from being within the city's limits. Although right wing radicals were the bedrock of support for McCarthyism, they were not alone. A broad "coalition of the aggrieved" found McCarthyism attractive, or at least politically useful. Common themes uniting the coalition were opposition to internationalism, particularly the United Nations; opposition to social welfare provisions, particularly the various programs established by the New Deal; and opposition to efforts to reduce inequalities in the social structure of the United States. One focus of popular McCarthyism concerned the provision of public health services, particularly vaccination, mental health care services, and fluoridation, all of which were denounced by some to be communist plots to poison or brainwash the American people. Such viewpoints led to collisions between McCarthyite radicals and supporters of public health programs, most notably in the case of the Alaska Mental Health Bill controversy of 1956. William F. Buckley Jr., the founder of the influential conservative political magazine National Review, wrote a defense of McCarthy, McCarthy and his Enemies, in which he asserted that "McCarthyism is a movement around which men of good will and stern morality can close ranks." In addition, as Richard Rovere points out, many ordinary Americans became convinced that there must be "no smoke without fire" and lent their support to McCarthyism. The Gallup poll found that at his peak in January 1954, 50% of the American public supported McCarthy, while 29% had an unfavorable opinion. His support fell to 34% in June 1954. Republicans tended to like what McCarthy was doing and Democrats did not, though McCarthy had significant support from traditional Democratic ethnic groups, especially Catholics, as well as many unskilled workers and small business owners. (McCarthy himself was a Catholic.) He had very little support among union members and Jews.

Those who sought to justify McCarthyism did so largely through their characterization of communism, and American communists in particular. Proponents of McCarthyism claimed that the CPUSA was so completely under Moscow's control that any American communist was a puppet of the Soviet intelligence services. This view, if restricted to the Communist Party's leadership as well as post war decodes of wartime Soviet radio traffic from the Venona project, showing that Moscow provided financial support to the CPUSA and had significant influence on CPUSA policies. J. Edgar Hoover commented in a 1950 speech, "Communist members, body and soul, are the property of the Party." According to historian Richard G. Powers, McCarthy added "bogus specificity" to "sweeping accusation[s]", gaining support among "countersubversive anticommunists" on one hand, who sought to find and punish perceived communists. On the other hand, "liberal anticommunists" believed that the Communist Party was "despicable and annoying" but ultimately politically irrelevant. President Harry Truman, who pursued the anti Soviet Truman Doctrine, called McCarthy "the greatest asset the Kremlin has" by "torpedo[ing] the bipartisan foreign policy of the United States." Historian Landon R. Y. Storrs writes that the CPUSA's "secretiveness, its authoritarian internal structure, and the loyalty of its leaders to the Kremlin were fundamental flaws that help explain why and how it was demonized. On the other hand, most American Communists were idealists attracted by the party's militance against various forms of social injustice." Furthermore, based on later declassified evidence, "The paradoxical lesson from several decades of scholarship is that the same organization that inspired democratic idealists in the pursuit of social justice also was secretive, authoritarian, and morally compromised by ties to the Stalin regime." In the mid 20th century, this attitude was not confined to arch conservatives. In 1940, the American Civil Liberties Union ejected founding member Elizabeth Gurley Flynn, saying that her membership in the Communist Party was enough to disqualify her as a civil libertarian. In the government's prosecutions of Communist Party members under the Smith Act (see above), the prosecution case was based not on specific actions or statements by the defendants, but on the premise that a commitment to violent overthrow of the government was inherent in the doctrines of Marxism–Leninism. Passages of the CPUSA constitution that specifically rejected revolutionary violence were dismissed as deliberate deception. In addition, it was often claimed that the party didn't allow members to resign; thus someone who had been a member for a short time decades previously could be thought a current member. Many of the hearings and trials of McCarthyism featured testimony by former Communist Party members such as Elizabeth Bentley, Louis Budenz, and Whittaker Chambers, speaking as expert witnesses. Various historians and pundits have discussed alleged Soviet directed infiltration of the U. S. government and the possible collaboration of high U. S. government officials.

The nation was by no means united behind the policies and activities that have come to be associated with McCarthyism. The critics of various aspects of McCarthyism included many figures not generally noted for their liberalism. In his overridden veto of the McCarran Internal Security Act of 1950, President Truman wrote, "In a free country, we punish men for the crimes they commit, but never for the opinions they have." Truman also unsuccessfully vetoed the Taft–Hartley Act, which among other provisions denied trade unions National Labor Relations Board protection unless union leaders signed affidavits swearing they were not and had never been Communists. In 1953, after he left office, Truman criticized the current Eisenhower administration:

It is now evident that the present Administration has fully embraced, for political advantage, McCarthyism. I am not referring to the Senator from Wisconsin. He is only important in that his name has taken on the dictionary meaning of the word. It is the corruption of truth, the abandonment of the due process law. It is the use of the big lie and the unfounded accusation against any citizen in the name of Americanism or security. It is the rise to power of the demagogue who lives on untruth; it is the spreading of fear and the destruction of faith in every level of society. On June 1, 1950, Senator Margaret Chase Smith, a Maine Republican, delivered a speech to the Senate she called a "Declaration of Conscience". In a clear attack upon McCarthyism, she called for an end to "character assassinations" and named "some of the basic principles of Americanism: The right to criticize; the right to hold unpopular beliefs; the right to protest; the right of independent thought". She said "freedom of speech is not what it used to be in America", and decried "cancerous tentacles of 'know nothing, suspect everything' attitudes". Six other Republican senators—Wayne Morse, Irving M. Ives, Charles W. Tobey, Edward John Thye, George Aiken, and Robert C. Hendrickson—joined Smith in condemning the tactics of McCarthyism. Elmer Davis, one of the most highly respected news reporters and commentators of the 1940s and 1950s, often spoke out against what he saw as the excesses of McCarthyism. On one occasion he warned that many local anti communist movements constituted a "general attack not only on schools and colleges and libraries, on teachers and textbooks, but on all people who think and write in short, on the freedom of the mind". In 1952, the Supreme Court upheld a lower court decision in Adler v. Board of Education, thus approving a law that allowed state loyalty review boards to fire teachers deemed "subversive". In his dissenting opinion, Justice William O. Douglas wrote: "The present law proceeds on a principle repugnant to our society—guilt by association What happens under this law is typical of what happens in a police state. Teachers are under constant surveillance; their pasts are combed for signs of disloyalty; their utterances are watched for clues to dangerous thoughts." One of the most influential opponents of McCarthyism was the famed CBS newscaster and analyst Edward R. Murrow. On October 20, 1953, Murrow's show See It Now aired an episode about the dismissal of Milo Radulovich, a former reserve Air Force lieutenant who was accused of associating with Communists. The show was strongly critical of the Air Force's methods, which included presenting evidence in a sealed envelope that Radulovich and his attorney were not allowed to open. On March 9, 1954, See It Now aired another episode on the issue of McCarthyism, this one attacking Joseph McCarthy himself. Titled "A Report on Senator Joseph R. McCarthy", it used footage of McCarthy speeches to portray him as dishonest, reckless, and abusive toward witnesses and prominent Americans. In his concluding comment, Murrow said:

blockquote|We must not confuse dissent with disloyalty. We must remember always that accusation is not proof and that conviction depends upon evidence and due process of law. We will not walk in fear, one of another. We will not be driven by fear into an age of unreason, if we dig deep in our history and our doctrine, and remember that we are not descended from fearful men. In April 1954, McCarthy was also under attack in the Army–McCarthy hearings. These hearings were televised live on the new American Broadcasting Company network, allowing the public to view first hand McCarthy's interrogation of individuals and his controversial tactics. In one exchange, McCarthy reminded the attorney for the Army, Joseph Welch, that he had an employee in his law firm who had belonged to an organization that had been accused of Communist sympathies. In an exchange that reflected the increasingly negative public opinion of McCarthy, Welch rebuked the senator: "Have you no sense of decency, sir? At long last, have you left no sense of decency?"

In the mid and late 1950s, the attitudes and institutions of McCarthyism slowly weakened. Changing public sentiments heavily contributed to the decline of McCarthyism. Its decline may also be charted through a series of court decisions.

A key figure in the end of the blacklisting of McCarthyism was John Henry Faulk. Host of an afternoon comedy radio show, Faulk was a leftist active in his union, the American Federation of Television and Radio Artists. He was scrutinized by AWARE, Inc., one of the private firms that examined individuals for signs of communist "disloyalty". Marked by AWARE as unfit, he was fired by CBS Radio. Almost uniquely among the many victims of blacklisting, Faulk decided to sue AWARE in 1957 and finally won the case in 1962. With this court decision, the private blacklisters and those who used them were put on notice that they were legally liable for the professional and financial damage they caused. Although some informal blacklisting continued, the private "loyalty checking" agencies were soon a thing of the past. Even before the Faulk verdict, many in Hollywood had decided it was time to break the blacklist. In 1960, Dalton Trumbo, one of the best known members of the Hollywood Ten, was publicly credited with writing the films Exodus and Spartacus.

Much of the undoing of McCarthyism came at the hands of the U. S. Supreme Court under Chief Justice Earl Warren. Two Eisenhower appointees to the court—Earl Warren (who was made Chief Justice) and William J. Brennan, Jr.—proved to be more liberal than Eisenhower had anticipated. The Warren Court made a series of rulings that helped bring an end to the McCarthyism. In addition, the 1956 Cole v. Young ruling also greatly weakened the ability to discriminate in the federal civilian workforce. Another key decision was in the 1957 case Yates v. United States, in which the convictions of fourteen Communists were reversed. In Justice Black's opinion, he wrote of the original "Smith Act" trials: "The testimony of witnesses is comparatively insignificant. Guilt or innocence may turn on what Marx or Engels or someone else wrote or advocated as much as a hundred years or more ago When the propriety of obnoxious or unfamiliar view about government is in reality made the crucial issue, prejudice makes conviction inevitable except in the rarest circumstances." Also in 1957, the Supreme Court ruled on the case of Watkins v. United States, curtailing the power of HUAC to punish uncooperative witnesses by finding them in contempt of Congress. Justice Warren wrote in the decision: "The mere summoning of a witness and compelling him to testify, against his will, about his beliefs, expressions or associations is a measure of governmental interference. And when those forced revelations concern matters that are unorthodox, unpopular, or even hateful to the general public, the reaction in the life of the witness may be disastrous." In its 1958 decision in Kent v. Dulles, the Supreme Court halted the State Department from using the authority of its own regulations to refuse or revoke passports based on an applicant's communist beliefs or associations.

The political divisions McCarthyism created in the United States continue to make themselves manifest, and the politics and history of anti communism in the United States are still contentious. Portions of the massive security apparatus established during the McCarthy era still exist. Loyalty oaths are still required by the California Constitution for all officials and employees of the government of California (which is highly problematic for Quakers and Jehovah's Witnesses whose beliefs preclude them from pledging absolute loyalty to the state). At the federal level, a few portions of the McCarran Internal Security Act remain in effect. However, the act's detention provision was repealed in 1971. The McCarran Act's Communist registration requirement was declared unconstitutional in the 1965 Supreme Court ruling in Albertson v. Subversive Activities Control Board as well. The McCarran Act's Subversive Activities Control Board, which enforced the law's investigation requirement for persons alleged to be involved in "subversive activities", was officially abolished through Congressional legislation in 1972 as well.

McCarthyism also attracts controversy purely as a historical issue. Through declassified documents from Soviet archives and Venona project decryptions of coded Soviet messages, the Soviet Union was found to have engaged in substantial espionage activities in the United States during the 1940s. The Communist Party USA also was substantially funded and its policies controlled by the Soviet Union, and accusations existed that CPUSA members were often recruited as spies. Liberal anti communists like Edward Shils and Daniel Moynihan had a contempt for McCarthyism. Sociologist Edward Shils criticized an excessive policy of secrecy during the Cold War, that led to the misdirection of McCarthyism, which was addressed during the 1994–1997 Moynihan Commission. As Moynihan put it, "reaction to McCarthy took the form of a modish anti anti Communism that considered impolite any discussion of the very real threat Communism posed to Western values and security." After revelations of Soviet spy networks from the declassified Venona project, Moynihan wondered: "Might less secrecy have prevented the liberal overreaction to McCarthyism as well as McCarthyism itself?" He described the situation during the McCarthy era as "ignorant armies clashed by night". With McCarthy advocating an extremist view, the discussion of communist subversion was made into a civil rights issue instead of a counterintelligence one. In the view of some contemporary commentators, the revelations from Venona and other archives on espionage stand as at least a partial vindication of McCarthyism. Some, such as Goldberg, feel that a genuinely dangerous subversive element was in the United States, and that this danger justified extreme measures. The opposing view holds that, recent revelations notwithstanding, by the time McCarthyism began in the late 1940s, the CPUSA was an ineffectual fringe group, and the damage done to U. S. interests by Soviet spies after World War II was minimal. Historian Ellen Schrecker states, "in this country, McCarthyism did more damage to the constitution than the American Communist Party ever did." Historian John Earl Haynes, while acknowledging that inexcusable excesses occurred during McCarthyism, argues that some contemporary historians of McCarthyism underplay the un democratic nature of the CPUSA. At the same time, Haynes, who studied the Venona decryptions extensively, argued that McCarthy's attempts to "make anti communism a partisan weapon" actually "threatened [the post War] anti Communist consensus", thereby ultimately harming anti Communist efforts more than helping them. Of the 159 people who were identified on lists used or referenced by McCarthy, evidence only substantially proved that nine of them had aided Soviet espionage efforts—while several hundred Soviet spies were actually known based on Venona and other evidence, most were never named by McCarthy.

A number of observers have compared the oppression of liberals and leftists during the McCarthy period to 2000s era actions against suspected terrorists, most of them Muslims. In The Age of Anxiety: McCarthyism to Terrorism, author Haynes Johnson compares the "abuses suffered by aliens thrown into high security U. S. prisons in the wake of 9/11" to the excesses of the McCarthy era. Similarly, David D. Cole has written that the Patriot Act "in effect resurrects the philosophy of McCarthyism, simply substituting 'terrorist' for 'communist'." From the opposite pole, conservative writer Ann Coulter devotes much of her book Treason to drawing parallels between past opposition to McCarthy and McCarthyism and the policies and beliefs of modern day liberals, arguing that the former hindered the anti communist cause and the latter hinder the War on Terrorism. Other authors who have drawn on a comparison between current anti terrorism policies and McCarthyism include Geoffrey R. Stone, Ted Morgan, and Jonah Goldberg.

The 1951 novel The Troubled Air by Irwin Shaw tells the story of the director of a (fictional) radio show, broadcast live at the time, who is given a deadline to investigate his cast for alleged links to communism. The novel recounts the devastating effects on all concerned. The 1952 Arthur Miller play The Crucible used the Salem witch trials as a metaphor for McCarthyism, suggesting that the process of McCarthyism style persecution can occur at any time or place. The play focused on the fact that once accused, a person had little chance of exoneration, given the irrational and circular reasoning of both the courts and the public. Miller later wrote: "The more I read into the Salem panic, the more it touched off corresponding images of common experiences in the fifties." The 1976 film The Front starring Woody Allen dealt with the McCarthy era Hollywood blacklist. The film was made by those blacklisted: producer and director Martin Ritt; writer Walter Bernstein; and actors Zero Mostel, Herschel Bernardi, Michael Murphy, John Randolph, Lloyd Gough, and Joshua Shelley. The 1985 film Clue is set during the Army–McCarthy hearings, with footage of the hearings seen on a television set. The characters reveal they are being blackmailed by Mr. Boddy, who threatens to expose their secrets to the HUAC. Guilty by Suspicion is a 1991 American drama film about the Hollywood blacklist, McCarthyism, and the activities of the HUAC. Written and directed by Irwin Winkler, it starred Robert De Niro, Annette Bening, and George Wendt. The 2005 film Good Night, and Good Luck by George Clooney starred David Strathairn as broadcast journalist Edward R. Murrow and contained archival footage of McCarthy. The 2016 opera Fellow Travelers, based on the 2007 novel by Thomas Mallon, is set in McCarthy era Washington D. C. and focuses on the "lavender scare", a witch hunt and mass firings of gay people from the United States government. The 2023 mini series Fellow Travelers, also based on the 2007 novel by Thomas Mallon, centers on the decades long romance between two men who first meet during the height of McCarthyism.

Haynes, John Earl. "The Cold War debate continues: A traditionalist view of historical writing on domestic Communism and anti Communism." Journal of Cold War Studies 2.1 (2000): 76–115. Hixson Jr, William B. Search for the American right wing: An analysis of the social science record, 1955–1987 (Princeton University Press, 2015). Reeves, Thomas C. "McCarthyism: Interpretations since Hofstadter." Wisconsin Magazine of History (1976): 42–54. online
Selverstone, Marc J. "A Literature So Immense: The Historiography of Anticommunism." Organization of American Historians Magazine of History 24.4 (2010): 7–11.