The Nazi German government implemented Generalplan Ost for the colonization of Central and Eastern Europe.[319] Implementation of the plan necessitated genocide[320] and ethnic cleansing on a vast scale to be undertaken in territories occupied by Germany during World War II.[320] The plan entailed the enslavement, expulsion, and partial destruction of most Slavic peoples in Europe, whom the Nazis viewed as racially inferior and non-Aryan.[320][321] The programme operational guidelines, prepared in the years 1939–1942, were based on the policy of Lebensraum designed by Adolf Hitler and the Nazi movement, as well as being a fulfillment of the Drang nach Osten (English: Drive towards the East) ideology of German expansion to the east. As such, it was intended to be a part of the New Order in Europe.[320]