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- History15
- United States. Federal Bureau of Investigation15
- Intelligence service9
- Internal security6
- Abuse of administrative power4
- Cold War3
- Espionage, Soviet3
- Politics and government3
- Criminal investigation2
- National security2
- United States. Central Intelligence Agency2
- Freedom of information1
- Hoover, J. Edgar (John Edgar), 1895-19721
- Nichols, Louis1
- Tolson, Clyde1