“Theosophy, organized as a body of knowledge similar in text to Scientology has been declared a religion by U.S. Federal Courts.
Founding Church of Washington D. C.
FBI: DBA Founding Church of Scientology Washington, D.C. (May 29, 1974)
FBI: The Founding Church of Scientology v. United States (August 23, 1966)
FBI: Letter from Director John Edgar Hoover to [?] (January 22, 1963)
Your letter of January 15th has been received, and the motives prompting your contacting this Bureau are appreciated.