Phan Bội Châu
In 1907, he joined the "Đông Kinh Nghĩa Thục" school, founded by Phan Chu Trinh with the help of Phan Bội Châu in teaching materials. Then in 1908 the French cracked down on Progressive Movement, they captured all members, executed the leaders and imprisoned others. Phan Khôi was sent back to prison in Điện Bàn. In 1909, being pardoned by the French, he went to Huê and studied at the Pellerin School (1909–11).