Terrorism Prevention 49 National security 15 Terrorismo 15 Islam 14 Law and legislation 12 Political violence 12 History 11 Political aspects 10 Religious aspects 10 Security measures 10 Government policy 9 Security, International 9 Terrorisme 8 Criminology, Penology & Juvenile Delinquency 7 Radicalism 7 Violence 7 Foreign relations 6 Political Science 6 Social aspects 6 Terrorism and Political Violence 6 Terrorists 6 ETA (Organization) 5 International relations 5 Transportation 5 Civil defense 4 Crime prevention 4 Finance 4 Islamic fundamentalism 4 Money laundering 4