Joseph Raymond McCarthy (November 14, 1908 – May 2, 1957) served as a Republican U.S. Senator from the state of Wisconsin from 1947 until his death in 1957. Beginning in 1950, McCarthy became the most visible public face of a period of intense anti-communist suspicion inspired by the tensions of the Cold War.

He was noted for making claims that there were large numbers of Communists and Soviet spies and sympathizers inside the federal government and elsewhere. Ultimately, McCarthy's tactics and his inability to substantiate his claims led to his being discredited and censured by the United States Senate.

The term McCarthyism, coined in 1950 in reference to McCarthy's practices, was soon applied to similar anti-communist pursuits. Today the term is used more generally to describe demagogic, reckless, and unsubstantiated accusations, as well as public attacks on the character or patriotism of political opponents.

But in the 1950s. many thousands of Americans were accused of being Communists or communist sympathizers and became the subject of aggressive investigations and questioning before government or private-industry panels, committees and agencies. The primary targets of such suspicions were government employees, those in the entertainment industry, educators, and union activists.

Suspicions were often given credence despite inconclusive or questionable evidence, and the level of threat posed by a person's real or supposed leftist associations or beliefs was often greatly exaggerated. Many people suffered loss of employment, destruction of their careers, and even imprisonment. Most of these punishments came about through trial verdicts later overturned, laws that would be declared unconstitutional, dismissals for reasons later declared illegal or actionable, or extra-legal procedures that would come into general disrepute.

The most famous examples of McCarthyism include the Hollywood blacklist and the investigations and hearings conducted by Joseph McCarthy. It was a widespread social and cultural phenomenon that affected all levels of society and was the source of a great deal of debate and conflict in the United States.

Born and raised on a Wisconsin farm, McCarthy earned a law degree at Marquette University in 1935 and was elected as a circuit judge in 1939, the youngest in state history. At age 33, McCarthy volunteered for the United States Marine Corps and served during World War II.

He successfully ran for the United States Senate in 1946, defeating Robert M. La Follette, Jr. After several largely undistinguished years in the Senate, McCarthy rose suddenly to national fame in 1950 when he asserted in a speech that he had a list of "members of the Communist Party and members of a spy ring" who were employed in the State Department.

McCarthyism was supported by a variety of groups, including the American Legion, Christian fundamentalists, and various other anti-communist organizations. One core element of support was a variety of militantly anti-communist women's groups such as the American Public Relations Forum and the Minute Women of the U.S.A.. These organized tens of thousands of housewives into study groups, letter-writing networks, and patriotic clubs that coordinated efforts to identify and eradicate subversion.

However, McCarthy was never able to substantiate his sensational charges. In succeeding years, McCarthy made accusations of Communist infiltration into the State Department, the administration of President Truman, Voice of America, and the United States Army.

He also used charges of communism, communist sympathies, or disloyalty to attack a number of politicians and other individuals inside and outside of government. With the highly publicized Army-McCarthy hearings of 1954, McCarthy's support and popularity began to fade.

Later in 1954, the Senate voted to censure Senator McCarthy by a vote of 67 to 22, making him one of the few senators ever to be disciplined in this fashion. McCarthy died in Bethesda Naval Hospital on May 2, 1957, at the age of 48. The official cause of death was acute hepatitis; it is widely accepted that this was brought on by alcoholism.

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