Columbia subject headings:
Communism--United States.
Motion pictures.
United States. Congress. House. Committee on Un-American Activities.
Harvard subject headings:
Communism--United States--1917-
Motion pictures--United States
United States. Congress. House. Committee on Un-American Activities.
Princeton subject headings:
Communism--United States.
Motion pictures--United States.
United States. Congress. House. Committee on Un-American Activities