Internal security History 108 Politics and government 108 National security 105 Prevention 46 Terrorism 45 Foreign relations 32 more ... Security, International 31 Intelligence service 28 Police 27 Anti-communist movements 25 Political aspects 25 Civil rights 23 Armed Forces 20 Subversive activities 20 Military policy 19 Communism 18 Government policy 18 Social aspects 18 Postwar reconstruction 17 Insurgency 16 Violence 15 Cold War 14 Crime prevention 14 Emigration and immigration 13 Law and legislation 13 Military assistance, American 12 Nation-building 12 Drug traffic 11 Secret service 11 less ...