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
People's Democratic Party of Afghanistan Nur Muhammad Taraki of the Khalq faction. In Kabul, the initial cabinet appeared to be carefully constructed to alternate ranking positions between Khalqis and Parchamis. Taraki was Prime Minister, Babrak Karmal was senior Deputy Prime Minister, and Hafizullah Amin was foreign minister. Once in power, the PDP embarked upon a program of rapid modernization centered on separation of Mosque and State, eradication of illiteracy (which at the time stood at 90%), land reform, emancipation of women, and abolition of feudal practices. A Soviet-style national flag replaced the traditional black, red, and green. Traditional practices that were deemed feudal - such