Alexander Pechersky organized the Sobibor uprising. Pechersky was conscripted into the Soviet Red Army with a rank of junior lieutenant On 18 September 1943; by September 1941, he was promoted to the rank of lieutenant quartermaster. In October 1941, during the Battle of Moscow, their unit was surrounded and captured by the Germans in the city of Vyazma, Smolensk Oblast. Pechersky, along with 2,000 Jews from Minsk including about 100 Soviet Jewish POWs, was placed in a railway cattle wagon which arrived at Sobibor a few days later.
According to the United States Holocaust Memorial Museum (USHMM), by the winter of 1941, "starvation and disease of Soviet POWs resulted in mass death of unimaginable proportions"...link
If the idea was to murder this officer he could have been dealt with by some Einsatz group and yet he is sent to Sobibor along with 100 other Soviet POW; the security risk would be enormous and it was as the Germans found out.
This information alone suggests that Sobibor had a function as a labour camp.
“Those who play with the devil's toys will be brought by degrees to wield his sword” – R. Buckminster Fuller, 1895