Sergeant Mutsuhiro Watanabe (渡邊 睦裕, Watanabe Mutsuhiro; 18 January 1918 – 1 April 2003), nicknamed "The Bird" by his prisoners, was a Japanese soldier who served in several prisoner-of-war camps during World War II. Infamous for his mistreatment of Allied prisoners of war, after the surrender of Japan in 1945 American occupational authorities classified Watanabe as a war criminal for his mistreatment and torture of POWs, but he managed to elude arrest and was never tried in court.
Source: “Mutsuhiro Watanabe”, English Wikipedia (CC BY-SA 4.0), excerpt