Shirō Ishii (specialist and microbiologist in Unit 731 who is also in the Japanese army) was granted immunity by the allies in exchange for extensive data, research reports, and details regarding their human experiments and biological weapons programs towards the Americans. US military intelligence officials wanted exclusive access to the biological warfare data desiring to keep it out of the hands of the Soviets. No, I am not making this up: he literally got away with endorsing torture towards people.