During the early Cold War period, fears of communist influence and infiltration in the United States led to a period known as the Red Scare. President Truman and congressional committees like HUAC investigated suspected communists. Notable investigations included those of the Hollywood Ten, Alger Hiss, and the Rosenbergs. Senator Joseph McCarthy further intensified fears by accusing many Americans of being communist sympathizers without proof. However, his reckless tactics were exposed during televised hearings, leading to his censure and the decline of the Red Scare.