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In 1932, General Shiro Ishii (石井四郎 Ishii Shirō), chief medical officer of the Japanese Army and protégé of Army Minister Sadao Araki was placed in command of the Army Epidemic Prevention Research Laboratory. He and his men built the Zhong Ma Prison Camp (whose main building was known locally as the Zhongma Fortress), a prison/experimentation camp in Beiyinhe, a village 100 kilometers south of Harbin on the South Manchurian Railway. Ishii organized a secret research group, the