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
History of Afghanistan (1978–92) quickly apparent. Taraki became president, prime minister and General Secretary of the PDPA, Hafizullah Amin as deputy prime minister. Parcham's leader, Babrak Karmal was also named deputy prime minister. Cabinet membership was split eleven to ten, with Khalq in the majority. Khalq dominated the Revolutionary Council, which was to serve as the ruling body of the government. Within weeks purges of Parcham began and by summer Khalq's somewhat bewildered Soviet patrons became aware of how difficult it would be to temper its radicalism. Once in power, the PDPA implemented a socialist agenda. It moved to promote state atheism. Men were