On May 21, 1942, 4,300 Jews are deported from the Polish town of Chelm to the Nazi extermination camp at Sobibor, where all are later gassed to death. On the same day, the German firm IG Farben sets up a factory just outside Auschwitz, in order to take advantage of Jewish slave laborers from the Auschwitz concentration camps.
Sobibor had five gas chambers, where about 250,000 Jews were killed between 1942 and 1943. A camp revolt occurred in October 1943; 300 Jewish slave laborers rose up and killed several members of the SS as well as Ukrainian guards. The rebels were killed as they battled their captors or tried to escape. The remaining prisoners were executed the very next day.