 The party suffered a split in late 1964/early 1965 in reaction to the Sino-Soviet split, with certain members either being expelled or voluntarily leaving to form the pro-Chinese Sudanese Communist Party – Revolutionary Leadership.From 1965 to 1967 there was constitutional controversy as other parties tried to outlaw the SCP from partaking in parliamentary elections.Some members advocating the establishment of an ideologically broader Socialist Party of the Sudan, which survived from 1967 to 1969.