Babrak Karmal befriended fellow inmate Mir Akbar Khyber, who introduced Karmal to Marxism. Karmal changed his name from Sultan Hussein to Babrak Karmal, which means "Comrade of the Workers'" in Pashtun, to disassociate himself from his bourgeois background. When he was released from prison, he continued his activities in the student union, and began to promote Marxism. Karmal spent the rest of the 1950s and the early 1960s becoming involved with Marxist organizations, of which there were at least four in Afghanistan at the time; two of the four were established by Karmal. When the 1964 Afghan Provisional Constitution, which legalised the
Babrak Karmal the Khalqists wanted to give PDPA Central Committee membership to military officers who had participated in the Saur Revolution; Karmal opposed such a move but was overruled. A PDPA Politburo meeting voted in favour of giving Central Committee membership to the officers. On 27 June, three months after the Saur Revolution, Amin outmaneuvered the Parchamites at a Central Committee meeting, giving the Khalqists exclusive right over formulating and deciding policy. A purge against the Parchamites was initiated by Amin and supported by Taraki on 1 July 1979. Karmal, fearing for his safety, went into hiding in one of his Soviet