Katzmann was responsible for many of the atrocities that were perpetrated by the SS during Operation Barbarossa. He personally directed the slaughter of between 55,000 and 65,000 Jews of Lemberg in 1941-1942 followed by mass deportations to death camps including Janowska (pictured). In 1943, Katzmann wrote a top-secret report summarizing Operation Reinhard in Galicia. The Katzmann Report is now considered one of the most important pieces of evidence of the extermination process. He managed to escape prosecution after the war, living under a false identity.