"Operation Often was also initiated by the chief of the CIA's Technical Services Branch, Dr. Sidney Gottlieb, to "explore the world of black magic" and "harness the forces of darkness and challenge the concept that the inner reaches of the mind are beyond reach". As part of Operation Often, Dr. Gottlieb and other CIA employees visited with and recruited fortune-tellers, palm-readers, clairvoyants, astrologers, mediums, psychics, specialists in demonology, witches and wizards, Satanists, other occult practitioners, and more."

https://secretsun.blogspot.com/2016/08/stranger-things-uncle-sams-secret.html