Lon Nol
The Cambodian coup of 1970, carried out by General Lon Nol, led to the end of Sihanouk's power and the establishment of the Khmer Republic. Hak was initially mooted as a leader of the "Pracheachon" party, a socialist party with which he had previously been involved, but eventually joined the Social Republican Party led by Lon Nol, and served as Prime Minister between 17 October 1972 and 17 April 1973.