Baigongguan (zh:白公馆) and Zhazidong (zh:渣滓洞) were Chinese concentration camps that opened in 1943 and were used by the Kuomintang (KMT) and the Sino-American Cooperative Organization (SACO) to gather intelligence about the Empire of Japan during the Second Sino-Japanese War. The camps were located in southwest China, in the Gele Mountains of Chongqing. In 1947, the camps were reopened by the Kuomintang to hold captured communist politicians of the Republic of China. After the Republic of China started its advance on the Empire of Japan and threatened the liberation of the camps, General Dai Li of the Kuomintang authorized the camps to serve as the execution sites of the communist politicians in 1949.