Son Sann
In 1975, with the Khmer Rouge forces surrounding the capital, Heng's name was published on a list of "Seven Traitors" (also including Lon Nol, Sisowath Sirik Matak, In Tam, Long Boret, Sosthene Fernandez and Son Ngoc Thanh) who were threatened with immediate execution in the event of a Communist victory. Heng fled the country on April 1 for Paris, where he became associated with the group of exiles centred on Son Sann.