No, we did not. Introducing you to Japanese Unit 731 [1] that was conducting atrocious human testing during World War 2 and whose information was happily collected afterwards with the promise of “forgetting” about the crimes committed.

> Shiro Ishii, as the chief of the unit, was granted war crime immunity from the US occupation authorities, because of his provision of human experimentation research materials to the US.

[1] https://en.m.wikipedia.org/wiki/Unit_731