During the time of 1930's Zhou Yang joined the left-wing league of China's writers for the revolution. He held that the function of literature and art is to make publicity. The function theory depended on the literature and art thought of duplication of life, illustration of life and judgment of life from the view point of the former Soviet writer Nikalai Gavilowich Chemyshevsky(1828-1889). After the Talk at the Yah 'an Forum on Literature and Art by Mao Zedong published, Zhou Yang thought the radical direction of art and literature is to ...