Prussia had settled in a big part of Poland generations before an area known as East Prussia. IBM in the Thirties had downloaded all public records, not only in Germany but in every country that they intended to conquer and, based on the genealogies in the public record, had preselected every victim of the Holocaust already alive in 1939. The Jews were already living in the Jewish quarter of Lodz and in the Warsava Ghetto and were mostly employed by the textile industry established by Prince Radziwil in 1797. Poles were used to Prussians marching around giving them orders and had been for centuries. vonAltenstadt, owner of Medunischken near Gdansk, and author of, "Our Way to the Sea" (Berlin, 1943) pushed thousands of Jews into the river with his men on horseback, at Kamenez Podolsk. This was called the Massacre at Kamenets and was considered a war crime, for which he had to relinquish his real name upon entering the United States as a citizen under Operation Paperclip.
Operation Paperclip by Annie Jacobsen.