Because of their brutality, Unit 731's actions have since been declared by the United Nations to have been crimes against humanity.
According to the 2002 International Symposium on the Crimes of Bacteriological Warfare, the number of people killed by the Imperial Japanese Army germ warfare and human experiments is around 580,000.
More than 95 percent of the victims who died in the camp based in Pingfang were Chinese and Korean, including both civilian and military. The remaining 5 percent were South East Asians and Pacific Islanders, at the time colonies of the Empire of Japan, and a small number of the prisoners of war from the Allies of World War II.
They were felicitated by the Japanese even Hirohito gave a free hand to Ishii the erstwhile Commander of this Unit for constructing and conducting further experiments and this unit was name Idhii Unit. Other members of Unit 731 were absorbed as administrators post World War II Japan.
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These terrible experiments were done under the leadership of Major Shiro Ishi, an army microbiologist. Many of those involved in these grissly Japanese experiments of Unit 731 became successful after the war. Quite a fewr held senior university posts in the field of medicine. Another headed up a leading Japanese pharmaceutical company. Still others gained positions ranging from President of the Japan Medical Association, through to Vice President of the renowned Green Cross Corporation. Unrepentant, Ishii died in 1959.