In April 1970, Yefremov was promoted to a higher position in Moscow and Gorbachev succeeded him as the First Secretary of the Stavropol kraikom. This granted Gorbachev significant power over the Stavropol region. He had been personally vetted for the position by senior Kremlin leaders and was informed of their decision by the Soviet leader, Leonid Brezhnev. Aged 39, he was considerably younger than his predecessors in the position. As head of the Stavropol region, he automatically became a member of the Central Committee of the Communist Party of the Soviet Union in 1971. According to biographer Zhores Medvedev, Gorbachev "had now joined the Party's super-elite". As regional leader, Gorbachev initially attributed economic and other failures to "the inefficiency and incompetence of cadres, flaws in management structure or gaps in legislation", but eventually concluded that they were caused by an excessive centralization of decision making in Moscow. He began reading translations of restricted texts by Western Marxist authors like Antonio Gramsci, Louis Aragon, Roger Garaudy, and Giuseppe Boffa, and came under their influence.