Intelligence service History 171 National security 140 Terrorism 102 Prevention 83 Foreign relations 62 Military intelligence 50 more ... Politics and government 48 Espionage 47 Law and legislation 47 Secret service 47 Government policy 45 Evaluation 36 Cold War 30 Internal security 29 International relations 28 Diplomatic relations 25 Electronic surveillance 23 Management 22 Civil rights 20 Spies 20 Intelligence officers 18 Political aspects 18 Privacy, Right of 17 Military policy 16 September 11 Terrorist Attacks, 2001 16 World War, 1939-1945 16 Interagency coordination 14 Officials and employees 13 Methodology 12 less ...