Secret service History 718 World War, 1939-1945 398 Spies 316 Service secret 174 Histoire 127 Military intelligence 116 more ... Guerre mondiale, 1939-1945 113 Intelligence service 102 Espionage 70 Vietnam War, 1961-1975 69 Foreign relations 67 Women spies 60 Intelligence officers 59 Campaigns 58 World War, 1914-1918 56 Espionage, American 53 HISTORY 52 Politics and government 51 Espionage, German 44 Presidents 42 Espions 41 Underground movements 41 Women 37 Officials and employees 36 Participation, Female 34 Social life and customs 33 Americans 32 Cryptography 32 Sabotage 30 less ...