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
Intelligenzaktion
Intelligenzaktion
Special Prosecution Book-Poland