MORGEN: Yesterday I described the four camps of the Kriminalkommissar Wirth and referred to the Camp Auschwitz. By "Extermination Camp Auschwitz" I did not mean the concentration camp. It did not exist there. I meant a separate extermination camp near Auschwitz, called "Monowitz."[...]MORGEN: The prisoners who marched off to the concentration camp had no inkling of where the other prisoners were taken. The Extermination Camp Monowitz lay far away from the concentration camp. It was situated on an extensive industrial site and was not recognizable as such and everywhere on the horizon there were smoking chimneys. The camp itself was guarded on the outside by special troops of men from the Baltic, Estonians, Lithuanians, Latvians, and also Ukrainians. The entire technical arrangement was almost exclusively in the hands of the prisoners who were assigned for this job and they were only supervised each time by an Unterfuehrer. The actual killing was done by another Unterfuehrer who let the gas into this room. Thus the number of those who knew about these things was extremely limited. This circle had to take a special oath...
Etc. Holocaust deniers have naturally carped on this ever since, given that the extermination camp was actually called Birkenau, so Morgen must have been coerced or was lying for another reason.