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 executions, the establishment of democratic institutions and free elections, the creation of a constitution, and legalization of alternative political parties. Prisoners incarcerated under the two previous governments would be freed in a general amnesty. He promised the creation of a coalition government which would not espouse socialism. At the same time, he told the Afghan people that he had negotiated with the Soviet Union to give economic, military and political assistance. The mistrust most Afghans felt towards the government was a problem for Karmal. Many still remembered he had said he would protect private capital in 1978—a promise later proven