During World War II , the Germans not only murdered Killing millions of Poles ( Jewish and otherwise ) , but ethnically cleansed Emptying millions more through forced Hostile_encounter deportation to make room for “ racially superior ” German settlers ( see Generalplan Ost and Lebensraum ) .

The genocidal policies of the German government 's colonization plan Arranging , `` Generalplan Ost '' , were the blueprint for German war Hostile_encounter crimes Committing_crime and crimes Committing_crime against humanity committed Commitment against the Polish nation from 1939 to 1945 .

The operation stemmed Creating from Nazi Germany 's ideological aim of conquering Conquering the western Soviet Union so that it could be repopulated by Germans ( ) , and to also use Using some Slavs as a slave labour force for the Axis war effort and to annihilate Killing the rest according to Generalplan Ost , and to acquire Getting the oil reserves of the Caucasus and the agricultural resources of Soviet territories .

Operation Military_operation Tannenberg ( ) was a codename for one of the extermination actions by Nazi Germany that was directed Aiming at the Poles during the opening Openness stages of World War II in Europe , as part of the `` Generalplan Ost '' for the German colonization of the East .

The `` Intelligenzaktion '' was a major step to implementing Action `` Sonderaktion Tannenberg '' ( Operation Tannenberg ) , the installation of Nazi policemen and functionaries — from the SiPo ( composed of the Kripo and Gestapo ) , and the SD — to manage Hold the occupation and facilitate Cause_to_make_progress the realisation of `` Generalplan Ost '' , the German colonization of Poland .