It turns out, according to Munro, that the forcible detention of political dissidents, whistleblowers, and religious groups has a long history in China. It reached its apogee during the period of the Cultural Revolution, between 1966 and 1976, then under the leadership of Mao Tse-Tung and the "Gang of Four," which instituted a very harsh and repressive regime. No opposition or deviance in practice or in thought was tolerated. Many of the dissidents were committed to psychiatric hospitals, particularly hospitals that were under the jurisdiction of the police, known as Ankang hospitals, where the commitment was made by forensic psychiatrists. It is noteworthy that the rationale of the forensic psychiatrists during the Maoist era was that dissidents' mental problems were caused by "incorrect or deviant thinking"—that is, these individuals were said to be possessed by bourgeois selfish ideas and personal concerns, which caused their mental illness.