HUAC, the /ˈhjuːæk ˌeɪtʃ juː eɪ ˈsiː/ BrE AmE abbreviation for
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 ↑ communist s . It stopped operating in 1975.