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
committee in the U.S. House of Representatives that investigated citizens that were thought to be communists (operated during the late 1940s and early 1950s)