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In page History of the People's Republic of China (1949–1976):

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In February 1957, Mao gave one of his most famous addresses in which he said, "Let a hundred flowers bloom, let a hundred schools of thought contend." The Hundred Flowers Campaign was promoted by the CCP as a way of furthering socialist ideology through open debate, but many took it as an invitation to express open disdain for the CCP. Many began to voice their opposition to the Party-State's rule. Thoroughly shocked, Mao put an end to this and then launched the Anti-Rightist Campaign. Scores of intellectuals and common workers were purged, jailed, or disappeared. Many were not "rehabilitated" until the 1970s.[citation needed]