Хенг Самрин
Since 1 February 1983 Say Phouthang (Secretary, Head of the Party Commission for Inspection), Chan Sy and Bou Thang occupied respectively the third, fourth and fifth positions in the Politburo. On 1 May 1985, Hun Sen was named the fourth, just behind the Heng Samrin, Chea Sim and Say Phouthang.