Columbia subject headings:
Harvard subject headings:
Anti-communist movements--United States--History--20th century
Hoover, J. Edgar (John Edgar), 1895-1972
Internal security--United States--History--20th century
Liberalism--United States--History--20th century
United States--Politics and government--1945-1989.
United States. Federal Bureau of Investigation
Princeton subject headings:
Anti-communist movements--United States--History--20th century.
Hoover, J. Edgar (John Edgar), 1895-1972.
Internal security--United States--History--20th century.
Liberalism--United States--History--20th century.
United States--Politics and government--1945-1989.
United States. Federal Bureau of Investigation