Mao went on to publicly denounce revisionism in April 1960. Without pointing fingers at the Soviet Union, Mao criticized its ideological ally, the League of Communists of Yugoslavia. In turn, the USSR criticized China's ally the Party of Labour of Albania. In 1963, the CCP began to denounce the Soviet Union openly, publishing nine polemics against its perceived revisionism, with one of them being titled "On Khrushchev's Phoney Communism and Historical Lessons for the World", in which Mao charged that Khrushchev was not only a revisionist but also increased the danger of capitalist restoration. Khrushchev's downfall from an internal "coup d'état" in 1964 also contributed to Mao's fears of his own political vulnerability, mainly because of his declining prestige among his colleagues after the Great Leap Forward.