Nazi Victory in WW2: what happens to the Volga Germans?

So, Germany wins in WW2, the USSR is pushed to the other side of the Volga and, though they face some seriously hard times (an uprising in Turkestan and a general collapse of authority, think China in Warlord Era), the Soviets manage to somewhat stabilise, largely thanks to Western supplies coming in from Archangel (which, due to never falling to the germans, they managed to retain).
So, in this scenario, with a weak (but not outright inexistent) authority over it's territory, what would happen to the Volga Germans? They were expelled in 1941 to Kazakhstan. Would they rise against the soviets? Would the USSR try to extermine them like the germans did with the slavs, or would they leave them alone? Could the Volga Germans try to go back to their original lands, now (partly) under german control?
 
So, Germany wins in WW2, the USSR is pushed to the other side of the Volga and, though they face some seriously hard times (an uprising in Turkestan and a general collapse of authority, think China in Warlord Era), the Soviets manage to somewhat stabilise, largely thanks to Western supplies coming in from Archangel (which, due to never falling to the germans, they managed to retain).
So, in this scenario, with a weak (but not outright inexistent) authority over it's territory, what would happen to the Volga Germans? They were expelled in 1941 to Kazakhstan. Would they rise against the soviets? Would the USSR try to extermine them like the germans did with the slavs, or would they leave them alone? Could the Volga Germans try to go back to their original lands, now (partly) under german control?

I'd imagine the Soviets would, either formally through treaty or informally through winks and "gentle prods" to the local Volga German leaders to essentially repatriate the Volga Germans into Nazi controlled territory in order to get rid of the troublesome minority in the least aggravating ways to Berlin. Considering the Reichskommisariates are going to be desperate for ethnically German and loyal settlers to develop stable economies and security, I can't imagine they'd refuse.
 
The Communists among them would not want to immigrate to Nazi controled territory. They'd either be killed outright, or die slowly in a work camp. The others might not be returned to the Reich. Being fluent in Russian would make them useful as supervisors of Slavs on the German farms and urban businesses in the new Reich.
 
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