Workers of Shanghai No. 1 National Cotton Mill (上海国棉一) show Mao a wall with big-character posters. Its main slogan, top right: Only socialism can save China (只有社会主义能够救中国), other headlines are against right-wing fallacies and revisionism. This image refers to Mao’s visit to this factory in October 1957, where he indeed was shown big-character posters that had been put up during the Anti-Rightist Struggle.
The official author of this poster, mentioned in the impressum, is the "Shanghai No. 1 National Cotton Mill Workers' Amateur Art Group". The 2009 publication Ha Qiongwen (Shanghai: Shanghai renmin meishu chubanshe, 2009) contains Ha Qiongwen's sketches of workers used on this poster, and a design of the full image dated 1969. This shows he was the main designer, left unmentioned as he was under heavy attack by radical factions during the Cultural Revolution. Individual artists' authorship was frowned upon in general at the time, and giving credits to workers and collectives fitted better with the prevailing ideology.