Execution of Poles in Kórnik, Warthegau, October 20, 1939.
Countless Polish Catholics were killed by the German Socialist Nazis.
"The term 'Gau' refers to a geographic district of the National Socialist German Workers Party. After German occupation of Polish territory in 1939, the Nazi government, in an attempt to streamline party and administrative control, established the Reichsgau Danzig-Westpreussen and the Reichsgau Posen (later renamed Reichsgau Wartheland) in which the office of the Nazi Party leader (Gauleiter) and government administrator or Reich Lieutenant (Reichsstatthalter) were combined. Hence, Arthur Greiser simultaneously held the posts of Gauleiter and Reichsstatthalter in the Reichsgau Wartheland. The region was also frequently referred to simply as the 'Warthegau,' and its capital was Posen, or present-day Poznan. The Warthegau had an area of approximately 44,000 square kilometers and a population, overwhelmingly Polish and Roman Catholic, of more than 4.5 million." -- Jonathan Huener, from "Nazi Kirchenpolitik and Polish Catholicism in the Reichsgau Wartheland, 1939–1941."