IBM sold the system to Germany before the war, and it greatly facilitated the Holocaust because it made the big roundups a lot simpler. The prewar Jewish population in Germany was a fraction that of Poland’s, and the occupation of Poland was a necessity from the standpoint of carrying out the mass murders. Himmler said, “Polish Jewry is the genetic powerhouse of European Jewry.”
“It has been known for decades that the Nazis used Hollerith equipment and that IBM's German subsidiary during the 1930s — Deutsche Hollerith Maschinen GmbH (Dehomag) — supplied Hollerith equipment. As with hundreds of foreign-owned companies that did business in Germany at that time, Dehomag came under the control of Nazi authorities prior to and during World War II. It is also widely known that Thomas J. Watson, Sr., received and subsequently repudiated and returned a medal presented to him by the German government for his role in global economic relations.”