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
Saad Akbar Babrak not widely known. It is stated in the official file on Liaquat Ali Khan that Akbar was an "Afghan national and a professional assassin." Saad Akbar Babrak Said Akbar Khan Babrakzai (died 16 October 1951) was possibly an Afghan Pashtun, according to the government sources, and an ultra-Pashtun nationalist, an assassin who assassinated the first Prime Minister of Pakistan, Liaqat Ali Khan, in Rawalpindi Punjab Province, on October 16, 1951. On October 16, 1951, during a public meeting, Sayed Akbar Khan shot Liaqat twice in a park in Rawalpindi, Pakistan. The assassin was fatally shot by police officers seconds later.