Terrorism -- 27 Terrorism 19 Prevention -- 14 National security -- 9 Congresses -- 7 Congresses 6 Fiction 5 more ... Politics and government 5 Foreign relations -- 3 Biological weapons 2 Chemical weapons 2 Crisis management 2 Government policy 2 History 2 International relations 2 Islamic fundamentalism 2 Merchant marine -- 2 Military relations -- 2 Prevention 2 Radicalism -- 2 Violence -- 2 Addresses, essays, lectures 1 Afghan War, 2001- -- 1 African American police -- 1 Alien labor 1 Apostacy 1 Attempted assassination -- 1 Bombings -- 1 Business -- 1 Conspiracies 1 less ...