What did the house Un-American Activities Committee (HUAC) do?

The house Un-American Activities Committee (HUAC) do the investigation of radical organizations.
The House Committee on Un-American Activities (HCUA), popularly dubbed the House Un-American Activities Committee (HUAC), was an investigative committee of the United States House of Representatives, created in 1938 to Investigate alleged disloyalty and subversive activities on the part of private citizens, public employees, and those organizations suspected of having either fascist or communist ties.
It became a standing (permanent) committee in 1945, and from 1969 onwards it was known as the House Committee on Internal Security. When the House abolished the committee in 1975. Its functions were transferred to the House Judiciary Committee.
The committee's anti-communist Investigations are often associated with McCarthyism, although Joseph McCarthy himself (as a U.S. Senator) had no direct involvement with the House committee. McCarthy was the chairman of the Government Operations Committee and its Permanent House.
Investigation, examination, inquiry, research express the idea of an active effort to find out something. An Investigation is a systematic, minute, and thorough attempt to learn the facts about something complex or hidden, it is often formal and official, an Investigation of a bank failure.
An examination is an orderly attempt to obtain information about or to make a test of something, often something presented for observation: a physical examination. An inquiry is an Investigation made by asking questions rather than by inspection, or by study of available evidence: an inquiry into a proposed bond issue. Research is careful and sustained investigation.
Concerned with or tending to concentrate on fundamental aspects of a matter; searching or thoroughgoing. radical thought, a radical re-examination.
Favoring or tending to produce extreme or fundamental changes in political, economic, or social conditions, institutions, habits of mind, etc. is known as Radical Organization.
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