In the midst of Pol Pot's struggle for the control of the Cambodian Communist Party in the 1970s, the subject of the Party's history came to assume a crucial importance. In 1976, the date of the foundation of the Communist Party of Kampuchea (CPK) became so important an issue that veteran Party members who remembered that the Party had been founded at a date previous to that claimed by Pol Pot, were tortured and killed for that reason. History was rewritten to suit the interests of Pol Pot's faction and the political circumstances of the time. A particularly sensitive subject was the role played by the Vietnamese in the formation of the Khmer People's Revolutionary Party, the predecessor of the CPK in the 1950s. After the relations between the Vietnamese and Cambodian Parties turned sour in the mid-1970s, the CPK deleted all allusions to the Vietnamese role from its official Party History.