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President Truman established a loyalty program to investigate government employees for alleged communist ties.
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Alger Hiss, a former government official, was accused of being a communist spy. He was convicted of perjury.
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Senator McCarthy gains notice by accusing many people of being communists without evidence to prove himself.
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Julius and Ethel Rosenberg and found guilty of passing atomic secrets to the Soviet Union. They are executed which means they were handed the death penalty.
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The House Un-American Activities Committee conflicts hearing accusing people in the entertainment industry, like for example, the "Hollywood Ten".