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- Espionage
- History 10
- Intelligence service 8
- Spies 7
- Cold War 3
- Secret service 3
- Communism 2
- Political aspects 2
- Prevention 2
- Subversive activities 2
- World War, 1939-1945 2
- Academic freedom 1
- Arab-Israeli conflict 1
- Archaeologists 1
- Espionage, German 1
- Espionage, Soviet 1
- Fedayeen 1
- Foreign relations 1
- History, Modern 1
- Information society 1
- Information technology 1
- Informers 1
- International cooperation 1
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- Military intelligence 1
- National security 1
- Organized crime 1
- Power (Social sciences) 1
- Presidents 1
- Science 1
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