Top secret operation of the United States government to research and develop effective methods of mind control. Started by the CIA after the Korean War, MK-ULTRA sought to discover the best techniques for altering the mind in any way desired. Everything from hypnosis, drugs, surgery, "truth serums," LSD, ketamine, psilocybin, brain electrodes, lobotomy, and electroconvulsive shock were investigated.
While one aim of the program was to find the perfect way to extract information from captured enemy agents, another equally important goal was to create agents with so many levels of mental control that there was no way to torture important info out of them. Some researchers hoped to create mind control techniques that would allow the government to acquire secret agents who weren't even aware that they were secret agents.
The Church Committee of the U.S. Senate exposed MK-ULTRA, and the CIA promised to discontinue the program. You believe them, don't you?