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- Espionage, American370
- History186
- United States. Central Intelligence Agency161
- Foreign relations100
- Intelligence service79
- Spies72
- Cold War60
- Subversive activities42
- Politics and government37
- Secret service34
- Intelligence officers31
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- Relations25
- World War, 1939-194525
- Espionage, Soviet22
- Military intelligence17
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- Espionage, British15
- Officials and employees15
- Soviet Union. Komitet gosudarstvennoĭ bezopasnosti15