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In page Human rights violations by the CIA:

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In December 1974, The New York Times reported that the CIA had conducted illegal domestic activities, including experiments on U.S. citizens, during the 1960s. The report prompted investigations by both the U.S. Congress (in the form of the Church Committee) and a presidential commission (known as the Rockefeller Commission). The congressional investigations and the Rockefeller Commission report revealed that the CIA and the Department of Defense had in fact conducted experiments to influence and control human behavior through the use of psychoactive drugs such as LSD and mescaline and other chemical, biological, and psychological means. Experiments were often conducted without the subjects' knowledge or consent.