Execution of 56 Polish citizens; Wikimedia Commons
In December 1941 Karl Jäger, SS–Standartenführer of Einsatzkommando 3, chronicled a Nazi killing unit’s activities from July to November 1941. The Jäger Report meticulously documents the murder of 137,346 people. The vast majority were Jews, but communists, criminals, gypsies and others deemed undesirable were included in over 100 executions in 71 different locations.