As part of the new Presidium, Pol Pot became the country's Prime Minister. It was at this point that he took on the public pseudonym of "Pol Pot"; as no-one in the country knew who this was, a fictitious biography was presented. Pol Pot's key allies took the other two positions, with Nuon Chea as President of the Standing Committee of the National Assembly and Khieu Samphân as the head of state. In principle, the Khmer Rouge Standing Committee made decisions on the basis of the Leninist principle of democratic centralism. In reality it was more autocratic, with Pol Pot's decisions being implemented. The parliament which had been elected the previous year never met after 1976. In September 1976, Pol Pot publicly revealed that Angkar was a Marxist–Leninist organisation. In September 1977, at a rally in the Olympic Stadium, Pol Pot then revealed that Angkar was a pseudonym for the CPK. In September 1976, it was announced that Pol Pot had stepped down as Prime Minister, to be replaced by Nuon Chea, but in reality he remained in power, returning to his former position in October. This was possibly a diversionary tactic to distract the Vietnamese government while Pol Pot purged the CPK of individuals he suspected of harbouring Vietnamese sympathies. Despite their Marxist pretences, the Khmer Rouge sought to eradicate the working class, seeing it as a "decadent relic of the past". The Khmer Rouge also renounced communism in 1977, with Ieng Sary stating "We are not communists ... we are revolutionaries do not belong to the commonly accepted grouping of communist Indochina."