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HUAC, the
     
HUAC, the
the House Un-American Activities Committee
a group in the US House of Representatives which tried to find out whether US citizens were enemies of the government. It was especially active during the early 1950s as a result of McCarthyism. At this time, the Committee judged many cases involving politicians, military officers, and other well-known people who were believed to be Communists. It stopped operating in 1975.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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