Shirō Ishii , commander of Unit 731 received immunity in exchange for data gathered from his experiments on live prisoners . In 1981 John W. Powell published an article in the '' Bulletin of the Atomic Scientists '' detailing the experiments of Unit 731 and its open-air tests of germ warfare on civilians . It was printed with a statement by Judge Röling , the last surviving member of the Tokyo Tribunal , who wrote , " As one of the judges in the International Military Tribunal , it is a bitter experience for me to be informed now that centrally ordered Japanese war criminality of the most disgusting kind was kept secret from the Court by the U.S. government "
Unit 731
Unit 731
International Military Tribunal for the Far East