Prevention -- Terrorism -- 51 National security -- 14 Government policy -- 11 Terrorism 10 International cooperation 9 Prevention 9 more ... Government policy 7 Congresses 6 Congresses -- 6 Emergency management -- 5 Corruption -- 4 Politics and government 4 Foreign relations -- 3 Government publications -- 3 History -- 3 History. -- 3 Law and legislation -- 3 Security measures -- 3 Terrorists -- 3 Weapons of mass destruction 3 AIDS (Disease) -- 2 Computer networks -- 2 Economic sanctions, American 2 Fiction 2 History 2 Integrity -- 2 International cooperation -- 2 Islam 2 Law and legislation 2 less ...