Ngo Dinh Diem - After refusing Ho Chi Minh's invitation to join the Communist movement, Ngo Dinh Diem led South Vietnam from 1954 to 1963, when he was killed by his generals in a coup. His autocratic rule, exemplified by the imprisonment and execution of hundreds of Buddhists, and his refusal to institute land reforms, probably contributed to increasing popular support for Ho Chi Minh.
Ngo Dinh Nhu - The younger brother and chief political advisor of South Vietnamese leader Ngo Dinh Diem, Nhu ran his brother's regime of secret political movements, the Can Lao. He was assassinated, along with his brother, during the 1963 coup.
Kennedy's role in the Vietnam War. During the early 1960s, the U.S. military presence in Vietnam escalated as corruption and internal divisions threatened the government of South Vietnamese President Ngo Dinh Diem.