Secret service History 160 Service secret 151 World War, 1939-1945 109 HISTORY 104 Histoire 93 Guerre mondiale, 1939-1945 86 Spies 65 Intelligence service 48 General 44 Military 38 Espions 35 Military intelligence 35 Espionage 32 POLITICAL SCIENCE 32 Service des renseignements 29 World War II 29 BIOGRAPHY & AUTOBIOGRAPHY 27 Service des renseignements militaires 24 Historical 23 Espionnage 20 Campaigns 18 Espionage, German 18 Underground movements 17 Western 16 Cold War 15 Military campaigns 15 Diplomatic relations 14 Espionnage allemand 14 Foreign relations 14