 After the war began , the Nazis issued a ban on sexual relations between Germans and foreign slave workers . There were regulations enacted against the Ost @-@ Arbeiter ( " Eastern Workers " ) that included the death penalty for sexual relations with a German person . Heinrich Himmler , in his secret memorandum , Reflections on the Treatment of Peoples of Alien Races in the East , ( dated 25 May 1940 ) outlined the future plans for the non @-@ German populations in the East . Himmler believed the Germanization process in Eastern Europe would be complete when " in the East dwell only men with truly German , Germanic blood " . 
