The 2006 International Symposium on Diaspora Politics, sponsored by the Center for Basque Studies, brought together several world renowned experts in diaspora studies. Here they present their research on the main characteristics of contemporary ethno-national diasporas, and how their relationships with their homeland and host-society governments develop; communal strategies and tactics used by diasporas, and how effective they are in influencing the foreign policy of central governments; and ways ethnic identity maintenance influences social and political security issues both domestically and in foreign policy.