 Complete the following phrase:  In 1964, opposition within the Politburo and the Central Committee led to Khrushchevs removal as First Secretary. Leonid Brezhnev succeeded Khrushchev to the post as part of another collective leadership, together with Premier Alexei Kosygin and others. The office was renamed General Secretary in 1966. The collective leadership was able to limit the powers of the General Secretary during the Brezhnev Era. Brezhnevs influence grew throughout the 1970s as he was able to retain support by avoiding any radical reforms. Yuri Andropov and Konstantin Chernenko ruled the country in the same way as Brezhnev had. Mikhail Gorbachev ruled the Soviet Union as General Secretary until 1990, when the Communist Party lost its monopoly of power over the political system. The office of President of the Soviet Union was established so that Gorbachev still retained his role as leader of the Soviet Union. Following the failed 