Joseph McCarthy was a U.S. senator from Wisconsin known for leading a period of extreme anti-communism in the 1950s known as McCarthyism. He made reckless accusations that communist spies had infiltrated high levels of the U.S. government and other institutions. McCarthyism refers to his aggressive accusations and investigations of communist subversion with little or no proof. Eventually his accusations against the U.S. Army were investigated in widely televised hearings in 1954, where he was unable to substantiate his claims, leading to his censure by the Senate that same year. McCarthy died in 1957 still in office from health complications caused by alcoholism.