There were an additional 37,223 prisoners counted in the sub-camps near Dachau on April 26, 1945, the date of the last roll call. According to the US Army Report, there were approximately 7,000 prisoners who arrived at Dachau after April 26, 1945 who were not registered in the camp. They were prisoners from the sub-camps who had been evacuated to the main camp. One group of prisoners from a subcamp arrived on April 28th, escorted by Otto Moll, a notorious SS man who had formerly worked in the Auschwitz death camp.
SS-Obergruppenführer Reinhard Heydrich, head of the Reich Main Security Office (Reichssicherheitshauptamt or RSHA), convened what became known as the Wannsee Conference on 20 January 1942 at Am Großen Wannsee 56–58, a villa in Berlin's Wannsee suburb. The meeting had been scheduled for 9 December 1941, and invitations had been sent on 29 November, but it had been postponed.