四清

the Four Cleanups Movement (1963-66) / abbr. for 四清運動|四清运动[Si4 qing1 Yun4 dong4]

four / 4

Qing (Wade-Giles: Ch'ing) dynasty of imperial China (1644-1911) / surname Qing

clear / distinct / quiet / just and honest / pure / to settle or clear up / to clean up or purge

(of water etc) clear; clean / quiet; still / pure; uncorrupted / clear; distinct / to clear; to settle (accounts)

the Four Cleanups Movement (1963-66), which aimed to cleanse the politics, economy, organization and ideology of the Communist Party