As the Cold War grew more intense, Americans became concerned about their own security within the United States. The House Un-American Activities Committee investigated supposed Communist subversion in government. This committee questioned actors, directors, writers, and others about their possible Communist sympathies. Those identified as members of the Communist Party were "blacklisted" and lost their jobs. Those who cooperated with the committee were often asked to give information on other people that might be a part of the Communist Party.
In 1950, Julius and Ethel Rosenberg were charged with being Soviet spies for selling national secrets on the building of the atomic bomb. The Rosenbergs were found guilty and executed for spying. Many Americans doubted the Rosenberg's guilt. In 1997, with the release of the Venona Papers, the identities of several Americans who spied for the Soviet Union were revealed, including, Julius Rosenberg. The Venona Papers showed that some Soviet agents had been spying in the American government, science and industry during the Cold War.
In 1950, Senator Joseph McCarthy launched an anti-communist campaign. He shocked Americans by claiming that he knew the names of hundreds of Communists that had infiltrated the United States government. Like the Red Scare of the 1920s, McCarthy's allegations created fears of a Communist conspiracy to take over the United States.
After three years of hearings, McCarthy never provided real proof of the charges. "McCarthyism" is now used to describe people making accusations without evidence. McCarthy was formally censured (formally criticized) by the Senate. Although Senator McCarthy, never proved any of his claims, the witch hunt frightened many Americans.
This report showed that the Soviet Union had spies in the United States during the Cold War. ___________________________ ______________________