Ol' Willy
Arcane
The only ones who gassed anyone in WWII were AnglosHey, how about making a game about some unit in the "Vlasov army"?
Or if that is too spicy, how about some cossacks? You even have a nice ending scene for the game written for you:
The first to commit suicide, by hanging, was the Cossack editor Evgenij Tarruski. The second was General Silkin, who shot himself...The Cossacks refused to board the trucks. British soldiers [armed] with pistols and clubs began using their clubs, aiming at the heads of the prisoners. They first dragged the men out of the crowd, and threw them into the trucks. The men jumped out. They beat them again, and threw them onto the floor of the trucks. Again, they jumped out. The British then hit them with rifle butts until they lay unconscious, and threw them, like sacks of potatoes, in the trucks.
First, they refused to leave their barracks when ordered to do so. The military police then used tear gas, and, half-dazed, the prisoners were driven under heavy guard to the harbor where they were forced to board a Soviet vessel. Here the two hundred immediately started to fight. They fought with their bare hands. They started – with considerable success – to destroy the ship's engines. ... A sergeant ... mixed barbiturates into their coffee. Soon, all of the prisoners fell into a deep, coma-like sleep. It was in this condition that the prisoners were brought to another Soviet boat for a speedy return to Stalin's hangmen