Chełmno extermination camp
During October 1941, Adolf Eichmann and Brack decided to begin using "gassing vans" to murder Jews incapable of working, the first three of which were set up at Chełmno extermination camp. Not only did the Einsatzgruppen units assigned there kill Jews, but they also gassed Gypsies, people suffering with typhus, Soviet POWs, and the insane; all of whom were led into the vans, murdered, and then driven to nearby woods so their bodies could be placed in mass graves. On 23 June 1942 Brack wrote the following letter to Himmler: