After 1979, the Chinese leadership moved toward more pragmatic policies in almost all fields. The party encouraged artists, writers and journalists to adopt more critical approaches, although open attacks on party authority were not permitted. The Chinese government repudiated the Cultural Revolution. A major document presented at the September 1979 Fourth Plenum of the Eleventh National Party Congress Central Committee, gave a "preliminary assessment" of the entire 30-year period of Communist rule. At the plenum, party Vice Chairman Ye Jianying declared the Cultural Revolution "an appalling catastrophe" and "the most severe setback to socialist cause since [1949." The Chinese government's condemnation of the Cultural Revolution culminated in the "Resolution on Certain Questions in the History of Our Party Since the Founding of the People's Republic of China", adopted by the Sixth Plenary Session of the Eleventh Central Committee of the Communist Party of China. This stated that "Comrade Mao Zedong was a great Marxist and a great proletarian revolutionary, strategist and theorist. It is true that he made gross mistakes during the "cultural revolution", but, if we judge his activities as a whole, his contributions to the Chinese revolution far outweigh his mistakes. His merits are primary and his errors secondary." As political ideology was downgraded, numerous statues of Mao were removed around the country and portraits of Marx, Engels, Lenin, and Stalin were taken down from Tiananmen Square.