This is a study of the current problems of mass expulsion. Throughout the book, the author searches for the distinctive features of this practice and constantly juxtaposes international law and practice. Discussion about the international legal standards is illustrated by examples of recent cases of mass expulsion. The book deals with mass expulsion of aliens, migrant workers, refugees, nationals and stateless persons. Indirect mass expulsion through refugee general policies and population exchanges is also studied on the basis of recent examples. The final chapters deal with mass expulsion in time of war. The book concludes with a catalogue of black letter law on mass expulsion.