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In 1861, the French colonial government established Côn Đảo Prison on the island to house political prisoners. In 1954, it was turned over to the South Vietnamese government, who continued to use it for the same purpose. Notable prisoners held at Côn Sơn in the 1930s included Phạm Văn Đồng, Nguyễn An Ninh and Lê Đức Thọ.