Foreign relations -- 2 Negotiation 2 Cold War -- 1 Crisis management -- 1 Diplomatic history 1 Hostage negotiations -- 1 Influence 1 more ... Law enforcement -- 1 Negotiation -- 1 Nuclear arms control -- 1 Political culture -- 1 Political psychology -- 1 September 11 Terrorist Attacks, 2001 -- 1 War on Terrorism, 2001 -- 1 less ...