The Secret Chiefs
One organisation's founding correspondence with these supposed masters was investigated and called fabricated by a formal society for psychical research in the 1880s, though that verdict was itself later reconsidered a century afterward. A separate order's own founding correspondence with a similar hidden authority was shown to be an outright forgery by one of its own founders.
Helena Blavatsky's Mahatma Letters (1880–1884); Richard Hodgson's report to the Society for Psychical Research (1885); Vernon Harrison, 'J'Accuse: An Examination of the Hodgson Report of 1885', Journal of the Society for Psychical Research 53 (1986), 286–310
Hidden spiritual masters claimed as the true authority behind two of the most influential modern esoteric organisations.