&quot;Instead of being tried for war crimes, the researchers involved in Unit 731 were given immunity by the U.S. in exchange for their data on human experimentation.&quot;<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Unit_731" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Unit_731</a><p>A bit off topic but perhaps interesting to some.