was art used as a medium of propaganda in this?
Xuanchuanhua.
Cultural Revolution
he "xuanchuanhua" were artworks produced by the government and sold cheaply in store to be displayed in homes or workplaces. 
who was yu-chien kuan? was a Chinese-born German sinologist, writer and translator. where was he born? In Guangzhou, Guangdong, Republic of China. why did he escape? He was targeted for persecution in the Cultural Revolution and his marriage had failed. what was this revolution about? It was a sociopolitical movement. can you mention any person related to it? Mao Zedong. what happened on may 16? A document summarizing Mao's ideological justification for the Cultural Revolution was released. were people killed in this revolution? Yes, from 300 thousand to 500 thousand deaths.
wiki:11562358
Cultural Revolution [SEP] Propaganda art
They were vital to Mao's struggle in the Cultural Revolution, and Mao himself wrote his own "dazibao" at Beijing University on August 5, 1966, calling on the people to "Bombard the Headquarters." The "xuanchuanhua" were artworks produced by the government and sold cheaply in store to be displayed in homes or workplaces. The artists for these posters might be amateurs or uncredited professionals, and the posters were largely in a Socialist Realist visual style with certain conventions—for example, images of Mao were to be depicted as "red, smooth, and luminescent".