67 years ago today, on December 1, 1958 (October 21, 1958 lunar calendar), the Ngo Dinh Diem clique of South Vietnam poisoned political prisoners in the Phu Phu concentration camp. On December 1, 1958, the Ngo Dinh Diem clique of South Vietnam poisoned political prisoners in the Phu Phu concentration camp, resulting in a tragedy. Located 33 kilometers north of Saigon, Phu Phu concentration camp was a large prison for the Ngo Dinh Diem regime of South Vietnam to imprison former anti-Japanese war fighters and patriots. Political prisoners were often imprisoned up to 6-7 thousand. On December 1, the South Vietnamese authorities poisoned prisoners' meals, poisoning more than 6,000 people and killing more than 1,000 people. Afterwards, many people were burned to death. This atrocity aroused strong indignation and protests from the people of Vietnam and the world.