Prevention -- Terrorism -- 76 National security -- 20 Government policy -- 19 Terrorism 16 International cooperation 14 Prevention 11 more ... Government policy 10 Congresses 7 Emergency management -- 7 Foreign relations -- 7 Congresses -- 6 History -- 6 Politics and government 6 Corruption -- 5 Civil rights -- 4 Fiction 4 Government publications -- 4 Security measures -- 4 War on terrorism, 2001- 4 Weapons of mass destruction 4 Civil defense -- 3 History. -- 3 Law and legislation -- 3 Military policy 3 Political corruption -- 3 Political ethics -- 3 Politics and government -- 3 Security, International 3 Terrorists -- 3 less ...