After WWII the CIA recruited Nazi war criminals, who had worked on mind control/brainwashing techniques in Germany, to assist them with their own mind control experiments on unwitting US citizens
“Project MKUltra was the code name of a U.S. government covert research operation experimenting in the behavioral engineering of humans (mind control) through the CIA’s Scientific Intelligence Division. The program began in the early 1950s, was officially sanctioned in 1953, was reduced in scope in 1964, further curtailed in 1967 and “”officially halted”” in 1973. The program engaged in many illegal activities; in particular it used unwitting U.S. and Canadian citizens as its test subjects, which led to controversy regarding its legitimacy. MKUltra involved the use of many methodologies to manipulate people’s mental states and alter brain functions, including the surreptitious administration of drugs (especially LSD) and other chemicals, hypnosis, sensory deprivation, isolation, verbal and sexual abuse, as well as various forms of torture.
The scope of Project MKUltra was broad, with research undertaken at 80 institutions, including 44 colleges and universities, as well as hospitals, prisons and pharmaceutical companies. The CIA operated through these institutions using front organizations, although sometimes top officials at these institutions were aware of the CIA’s involvement.
Project MKUltra was first brought to public attention in 1975 by the Church Committee of the U.S. Congress, and a Gerald Ford commission to investigate CIA activities within the United States. Investigative efforts were hampered by the fact that CIA Director Richard Helms ordered all MKUltra files destroyed in 1973; the Church Committee and Rockefeller Commission investigations relied on the sworn testimony of direct participants and on the relatively small number of documents that survived Helms’ destruction order.
In 1977, a Freedom of Information Act request uncovered a cache of 20,000 documents relating to project MKUltra, which led to Senate hearings later that same year. In July 2001 some surviving information regarding MKUltra was officially declassified.”