Anti-Rightist Movement

The Anti-Rightist Movement (simplified Chinese: 反右运动; traditional Chinese: 反右運動; pinyin: Fǎn Yòu Yùndòng) in the People's Republic of China, which lasted from roughly 1957 to 1959, consisted of a series of campaigns to purge alleged "rightists" within the Communist Party of China (CPC) and abroad. The definition of rightists was not always consistent, sometimes including critics to the left of the government, but officially referred to those intellectuals who appeared to favor capitalism and were against collectivization. The campaigns were instigated by Chairman Mao Zedong and saw the political persecution of an estimated 550,000 people.

The Anti-Rightist Movement was a reaction against the Hundred Flowers Campaign which had promoted pluralism of expression and criticism of the government, even though initiation of both campaigns was controlled by Chairman Mao and were integrally connected. Going perhaps as far back as the Long March there had been resentment against "rightists" inside the CPC, for example, Zhang Bojun.

The first wave of attacks began immediately following the end of the Hundred Flowers movement in July 1957. By the end of the year, 300,000 people had been labeled as rightists, including the writer Ding Ling. Future premier Zhu Rongji, then working in the State Planning Commission, was purged in 1958. Most of the accused were intellectuals. The penalties included informal criticism, hard labor, and in some cases, execution.

...
Wikipedia