Internal security Politics and government 111 History 110 National security 107 Prevention 46 Terrorism 46 Foreign relations 32 more ... Security, International 31 Intelligence service 28 Police 27 Political aspects 26 Anti-communist movements 25 Civil rights 24 Armed Forces 20 Subversive activities 20 Communism 19 Military policy 19 Social aspects 19 Government policy 18 Postwar reconstruction 17 Insurgency 16 Crime prevention 15 Violence 15 Cold War 14 Law and legislation 14 Emigration and immigration 13 Military assistance, American 12 Nation-building 12 Secret service 12 Drug traffic 11 less ...