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 as an English and German translator, before quitting and leaving for military training. Karmal graduated from the College of Law and Political Science in 1960, and in 1961, he found work as an employee in the Compilation and Translation Department of the Ministry of Education. From 1961 to 1963 he worked in the Ministry of Planning. When his mother died, Karmal left with his maternal aunt to live somewhere else. His father disowned him because of his leftist views. Karmal was involved in much debauchery, which was controversial in the mostly conservative Afghan society. Imprisoned from 1953 to 1956, Karmal