Columbia subject headings:
Harvard subject headings:
Government executives--United States--Biography
Hoover, J. Edgar (John Edgar), 1895-1972
Police--United States--Biography
Subversive activities--United States
United States. Federal Bureau of Investigation
Princeton subject headings:
Government executives--United States--Biography.
Hoover, J. Edgar (John Edgar), 1895-1972.
Police--United States--Biography.
Subversive activities--United States.
United States. Federal Bureau of Investigation