Jiangsu renmin chubanshe (江苏人民出版社)
A master worker "speaks bitterness", recounting life in pre-PRC society.
On the blackboard: 第一课 - 我的卖身契 (First lesson - My deed of indenture).
On the paper the man is crumbling: 卖身 (literally: sell oneself into slavery).
A similar image is E37/184, but on that one, the Mao badge is absent.