COMMENTS? "A gas van or gas wagon (Russian: душегубка (dushegubka); German: Gaswagen) was a vehicle reequipped as a mobile gas chamber. The vehicle had an air-tight compartment for victims, into which exhaust fumes were transmitted while the engine was running. The victims were gassed with carbon monoxide, resulting in death by monoxide poisoning and suffocation. The gas van was invented and used by the Soviet secret police NKVD in the late 1930s during the Great Purge" https://en.wikipedia.org/wiki/Gas_van "The founder of the "gas car" was the chief of an administrative department of Regional Office of NKVD for Moscow and the Moscow area Isay Davidovitch Berg . For destruction of people this car for the first time has been used in 1936 In 1939 Berg has been shot on charge in plot of employees of NKVD against heads of the state." "Other methods were used on an experimental basis. One policeman, Isay Davidovitch Berg, gassed some of his prisoners to death in batches in the back of a specially adapted airtight van." - Night of Stone: Death and Memory in Twentieth-Century Russia by Catherine Merridale, p. 200" " "The mobile gassing truck was invented and tested by Isay Davidovich Berg, head of the NKVD Economics Division in the Moscow region. In 1937, a second highpoint in the Great Purge, prisoners were sentenced to death in conveyor-belt fashion, packed into trucks, taken to the places of execution, shot in the back of the neck, and buried. In the economic sense, Isay Berg found this method of liquidation inefficient, time-consuming and cost-intensive. He, therefore, in 1937 designed the mobile asphyxiation chamber, the gassing truck (Russian: dushegubka, p. 297). The doomed were loaded into a tightly sealed, completely airtight Russian Ford; during the drive the deadly exhaust from a gasoline engine was directed into the section containing those sentenced to death. Upon reaching the mass gravesite, the truck dumped the corpses into the burial ditch.""