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Subject
- Espionage, American66
- History36
- United States. Central Intelligence Agency29
- Foreign relations21
- Intelligence service20
- Cold War15
- Intelligence officers9
- Spies8
- National security7
- Prevention7
- Diplomatic relations6
- Politics and government6
- Terrorism6
- Military intelligence5
- Espionage4
- September 11 Terrorist Attacks, 20014
- American fiction3
- Armed Forces3
- Autonomy and independence movements3
- Cyberterrorism3