The shadowy and sometimes bizarre operations of the CIA are kept top secret for many years, deemed necessary to protect national security. It's only decades later American citizens learn of alleged Russian alien encounters or mind control experiments recorded by the agency. But as the full release of files on the assassination of John F. Kennedy – running into the tens of thousands of pages – show, the CIA meticulously documents what it investigates. Here, The Post looks back at some of the CIA’s most audacious missions from their archives which have eventually been revealed to the public.