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During World War II, Japan operated a classified biological warfare program known as Unit 731.

During World War II, Japan operated a classified biological warfare program known as Unit 731. Prisoners were used in experiments that violated every known ethical standard. The man in charge, Shirō Ishii, later walked free. This is the story that was buried after the war:

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During World War II, Japan operated a classified biological warfare program known as Unit 731.
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During World War II, Japan operated a classified biological warfare program known as Unit 731. Prisoners were used in experiments that violated every known ethical standard. The man in charge, Shirō Ishii, later walked free. This is the story that was buried after the war:
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