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 their ideological nemesis being the Khalq faction. Under Karmal's leadership, the Parchamite PDPA participated in Mohammad Daoud Khan's rise to power in 1973, and his subsequent regime. While relations were good at the beginning, Daoud began a major purge of leftist influence in the mid-1970s. This in turn led to the reformation of the PDPA in 1977, and Karmal played a major role in the 1978 Saur Revolution when the PDPA took power, though in later years he denounced it. Karmal was appointed Deputy Chairman of the Revolutionary Council, synonymous with vice head of state, in the communist government. The