Generalplan Ost
Formally, the "Intelligenzaktion" was a second phase of Operation Tannenberg ("Unternehmen Tannenberg") conducted by Heydrich's "Sonderreferat". It lasted until January 1940 as the first part of the "Generalplan Ost". In Pomerania alone 36,000–42,000 Poles including children were killed already before the end of 1939.