Terrorism -- 31 Radicalism -- 28 Islam 12 Politics and government 12 Politics and government -- 12 Terrorism 12 Islam and politics -- 10 more ... Religious aspects -- 10 Foreign relations -- 8 Radicalism 8 History -- 7 Islamic fundamentalism -- 7 Islam -- 6 Radicals -- 6 International relations 5 National security -- 5 Political violence -- 5 Prevention 5 Foreign relations 4 Prevention -- 4 Relations -- 4 Right and left (Political science) 4 Communism -- 3 Congresses 3 Conservatism -- 3 Democracy 3 Economic policy -- 3 Fanaticism 3 Forecasting 3 Government publications -- 3 less ...