A Terrible Revenge: The Ethnic Cleansing of the East European Germans, 1944–1950 is a 1994 non-fiction book written by Cuban-born American lawyer Alfred-Maurice de Zayas, former research fellow at MPG in Heidelberg, Germany. The work is based on a collection of testimonials from German civilians and Wehrmacht military personnel; and devoted to the expulsion of Germans after World War II from states previously occupied by Nazi Germany. It includes as well selected interviews with British and American politicians who participated at the Potsdam Conference, including Robert Murphy, Geoffrey Harrison (drafter of article XIII of the Potsdam Protocol), and Denis Allen (drafter of article IX on the provisional post-war borders). The book attempts to describe the crimes committed against the Germa