Intelligence service 608 History 173 National security 141 Terrorism 103 Prevention 84 Foreign relations 63 Military intelligence 51 more ... Politics and government 48 Espionage 47 Law and legislation 47 Secret service 47 Government policy 46 Evaluation 36 Cold War 33 Internal security 30 International relations 28 Intelligence service -- United States 27 Diplomatic relations 25 Electronic surveillance 23 Management 22 Civil rights 20 Spies 20 Intelligence officers 19 Political aspects 18 September 11 Terrorist Attacks, 2001 18 World War, 1939-1945 18 Privacy, Right of 17 Military policy 16 Interagency coordination 14 Officials and employees 14 less ...