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In page Human rights in China:

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During the Mao era, one notorious labor camp called Xingkaihu which was located in the northeastern Heilongjiang Province was operated from 1955 to 1969.[4] During this time, over 20,000 inmates were forced to work on irrigation, infrastructure construction, and agricultural projects for the government while being subjected to ideological reform; a significant percentage of these inmates were incarcerated for being counterrevolutionaries and political dissidents.[4] The conditions in Xingkaihu were so poor that many inmates eventually died due to malnutrition and disease.[4]