Well i found out some more info and found that At the end of the war, MacArthur secretly granted immunity to the physicians of Unit 731 in exchange for providing America with their research on biological warfare. Also that the Russians did convict some of the people (2 to 25 years in prison). Still any opinons on why such little bieng done. If these men are still alive and the info is out there why are they still free? Or as in one case Shiro Ishii (a "doctor" of unit 731) moved to Maryland to work on bio-weapons research.