Columbia subject headings:
Internal security--United States--History--20th century.
United States--Politics and government--1933-1945.
United States. Congress. House. Special Committee on Un-American Activities (1938-1944)--History.
Harvard subject headings:
Internal security--United States--History--20th century
United States--Politics and government--1933-1945.
United States. Congress. House. Special Committee on Un-American Activities (1938-1944)--History.
Princeton subject headings: