"In January 1973, as Helms was leaving the Agency and James Schlesinger was coming in, Project OFTEN was abruptly canceled. And he ordered all documents pertaining to the unconscionable behavior control experiments: ARTICHOKE, MONARCH, OFTEN, Operation Midnight Crisis (collectively referred to as MK-ULTRA) destroyed. The outgoing CIA director and his trusted protégé hoped, no doubt, to wipe out all traces of the abominable experiments and all traces of the thousands of human victims."
ahrp.org/1973-richard-helms-and-sid-gottlieb-ordered-all-records-re-mind-control-projects-destroyed/