Columbia subject headings:
Civil rights--United States.
Communism--United States--1917-
United States. Congress--Committees.
Harvard subject headings:
Anti-communist movements--United States
Civil rights--United States
Communism--United States
Communism--United States--1917-
United States. Congress--Committees.
United States. Congress. House. Committee on Un-American Activities--1940-1950.
Princeton subject headings:
Civil rights--United States.
Communism--United States--1917-.
United States. Congress--Committees.