For decades, American intelligence agencies ran classified programs to find ways of controlling the human mind, and this episode of History's Mysteries reconstructs that effort from documents pried loose under the Freedom of Information Act. John Marks, author of "In Search of the Manchurian Candidate," walks through what the paper trail actually shows: drug tests, sensory deprivation, and psychological manipulation conducted on subjects who mostly had no idea what was being done to them. One interview centers on a woman who says the experiments erased pieces of her own memory, a personal account used to ground what could otherwise stay abstract. The film treats the FOIA releases as incomplete by design, noting how much was destroyed or redacted before ever reaching a researcher's hands. Rather than simply cataloging abuses, it follows the shape of the cover-up itself, how a government agency manages, delays, and buries a program it never wanted acknowledged in the first place.