Project MKUltra is the code name given to a program of experiments on human subjects that were designed and undertaken by the United States Central Intelligence Agency.
The project attempted to produce a perfect truth drug for interrogating suspected Soviet spies during the Cold War, and to explore other possibilities of mind control. Subproject 54 was the NavyNavy's top-secret "Perfect Concussion" program, which was supposed to use sub-aural frequency blasts to erase memory; the program was never carried out.[26]