Sonderfahndungsbuch Polen was prepared before the Invasion of Poland, between 1937 and 1939, by the “Zentralstelle IIP Polen” (Central Unit IIP-Poland) unit of the German political police, “Gestapo” with help from the German minority living in pre-war Poland. Central was created under Reinhard Heydrich to coordinate the ethnic cleansing of all Poles in “Operation Tannenberg" and Intelligenzaktion, the codenames for the extermination actions directed at the Polish people during World War II, part of the Generalplan Ost.