https://en.wikipedia.org/wiki/Unit_731
A bit off topic but perhaps interesting to some.
Where would America be in the space race, had they not done this? I think in hindsight, it was a pretty clever decision - these people were probably the most valuable war bounty America got out of the whole deal.
Unit 731's doctors were more akin to Mengele: personally hacking off living humans' half-frozen arms to see how they reacted in the cold, experiments with gangrene, etc...
Every single concentration camp "doctor" was deemed a war criminal. We didn't import them as a war bounty. Too bad we never did the same for Japan.
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* The only two exceptions seem to be Kurt Blome and Hubertus Strughold, both brought over in Paperclip, who probably perpetrated some nasty shit but were "tried" and given a pass.
But their involvement (they used slave labour with people possibly tortured or worked to death) was strong enough for some of them (especially higher ups) to be put to trial.
But the US is currently shipping weapons and money to brutal dictators in several countries in a horrible display of RealPolitik, so not much has changed.
"Yeah, these guys have some impressive technology and ideas that can revolutionize our world. But they killed a lot of people, so we're gonna just kill them"
Very rarely those who take the absolute high road win...