- a group of four radical members of the Chinese Communist Party who were leaders of the Cultural Revolution and who were purged and imprisoned after the death of Mao Zedong: Jiang Qing (widow of Mao), Wang Hongwen, Yao Wenyuan, and Zhang Chunqiao.
- a radical faction within the Chinese Communist Party that emerged as a political force in the spring of 1976 and was suppressed later that year. Its members, Zhang Chunqiao, Wang Hongwen, Yao Wenyuan, and Jiang Qing, were tried and imprisoned (1981)
