The title of this poster quotes a big character poster by Mao, in which he accuses other party leaders of treasonous and capitalist points of view and urges his supporters to overthrow his enemies. Big character posters were used extensively during the Cultural Revolution.
Ralph Croizier, "Hu Xian Peasant Painting: From Revolutionary Icon to Market Commodity", in: Richard King (ed.), Art in Turmoil. The Chinese Cultural Revolution, 1966-76 (Vancouver: UBC Press, 2010)