1947- . Afghan communist politician, a member of the Politburo from 1981, and leader of the ruling People's Democratic Party of Afghanistan (PDPA) from 1986, later state president. His attempts to broaden the support of the PDPA regime had little success, but his government survived the withdrawal of Soviet troops Feb 1989. A Pusthtun (Pathan), Najibullah joined the communist PDPA 1965, allying with its gradualist Parcham (banner) faction, and was twice imprisoned for anti-government political activities during the 1960s and 1970s. After the Soviet invasion Dec 1979, Najibullah became head of the KHAD secret police and entered the PDPA Politburo 1981. He replaced Babrak Karmal as leader of the PDPA, and thus the nation, May 1986. His hold on power became imperilled 1989 following the withdrawal of the Soviet military forces.