Prevention -- Terrorism -- 12 National security -- 8 Congresses 6 Congresses -- 5 Fiction 3 Emergency management -- 2 more ... Government policy 2 Security measures -- 2 African American police -- 1 Attempted assassination -- 1 Computer networks -- 1 Crisis management 1 Cross, Alex (Fictitious character) -- 1 Cyberspace -- 1 Cyberterrorism -- 1 Defenses -- 1 Emergency managemen 1 Epidemics -- 1 Fiction -- 1 Hostages 1 Influenza -- 1 Intelligence officers -- 1 International cooperation -- 1 Maritime terrorism -- 1 Merchant marine -- 1 Police -- 1 Police psyschologists -- 1 Political planning -- 1 Political violence -- 1 less ...