Secret service World War, 1939-1945 33 History 31 Intelligence service 18 Politics and government 12 Espionage, Soviet 8 Spies 8 Internal security 6 Military intelligence 6 Cold War 5 Strategy 4 Campaigns 3 Cryptography 3 Police 3 Abuse of administrative power 2 Espionage, Russian 2 Foreign relations 2 National security 2 Presidents 2 Smiley, George (Fictitious character) 2 State-sponsored terrorism 2 Underground movements 2 Women spies 2 Afghan War, 2001- 1 Army 1 Biography 1 Ciphers 1 Civil defense 1 Deception 1 Democracy 1