 Complete the following phrase:  By the early to mid-1970s Brezhnev had established a strong enough power base to effectively become leader. According to historian Ilya Zemtsov, the author of Chernenko: The Last Bolshevik: The Soviet Union on the Eve of Perestroika, Kosygin began to lose power with the 24th Party Congress in 1971 which for the first time publicized the formula the Politburo led by Brezhnev. Along with weakening Kosygins position, Brezhnev moved to strengthen the Partys hold on the Government apparatus, weakening Kosygins position further. Historian Robert Wesson, the author of Lenins Legacy: The Story of the CPSU, notes that Kosygins economic report to the 