The Intelligenzaktion (), or the Intelligentsia mass shootings, was a series of mass murders which was committed against the Polish intelligentsia (teachers, priests, physicians, and other prominent members of Polish society) early in the Second World War (1939–45) by Nazi Germany. The Germans conducted the operations in accordance with their plan to Germanize the western regions of occupied Poland, before their territorial annexation to the German Reich. The mass murder operations of the Intelligenzaktion resulted in the killing of 100,000 Polish people; by way of forced disappearance, the Germans imprisoned and killed select members of Polish society, identified as enemies of the Reich before the war; they were buried in mass graves which were dug in remote places. In order to facilitate the depopulation of Poland, the Germans terrorised the general populace by carrying out public, summary executions of select intellectuals and community leaders, before they effected the expulsion of the general population from occupied Poland. The executioners of the Einsatzgruppen death squads and members of the local Volksdeutscher Selbstschutz, the German-minority militia, justified their actions by falsely stating that the purpose of their police-work was to remove politically dangerous people from Polish society. The Intelligenzaktion was a major step towards the implementation of Sonderaktion Tannenberg (Special Operation Tannenberg), the installation of Nazi policemen and functionaries — from the SiPo (composed of Kripo and Gestapo members), and members of the SD — to manage the occupation and facilitate the realization of Generalplan Ost, the German colonization of Poland. Among the 100,000 people who were killed in the Intelligenzaktion operations, approximately 61,000 of them were members of the Polish intelligenzia, people who the Germans considered political targets according to the Special Prosecution Book-Poland, a book which was compiled before the war began in September 1939. The Intelligenzaktion occurred soon after the German invasion of Poland (1 September 1939), and lasted from the autumn of 1939 until the spring of 1940; the mass murder of the Polish intellectuals continued with the operations of the AB-Aktion. Purpose Adolf Hitler ordered the murder of the intelligentsia and the social élites of Poland to prevent them from organising the Poles against their German masters, and thwart the occupation and colonisation of the country; the mass murder was to occur before the annexation of Poland to the Greater Germanic Reich: Nazi racialism considered the Polish élites as being most likely of German blood, because their style