von Braun was asked if he knew of the conditions at the V-2 construction site. Not too surprisingly, he denied it. Unless there is some documented evidence that he knew about what was going on and had some hand in it, it'd be hard to charge him with war crimes. Of course, such evidence could've easily been sanitized.

On a sad but pragmatic point, the officials in charge at the time might've looked the other way even if they had evidence of his complicity, just like they did for the leaders of Japan's infamous Unit 731. People with special knowledge, even those who did reprehensible things during the war, were often given priority treatment.

And before Bowser or anyone else tries to make some political point against Republicans on these things, they happened during the Truman Administration. Given the increase in tension with the Soviet Union at the time, I understand what happened even though it stinks to high heaven.