From this report:
On September 13, 1963, […] Seattle, Washington Police Department, advised that on September 11, 1963,
WILLIAM J. FISK, Seattle, head of a religious mystical church was shot to death before members of his group in the Seattle headquarters in the Church of Scientology of Washington State. […] surrendered to the Seattle Police Department. He was charged with the premeditated killing and his apparent motive was his belief that his wife’s estrangement from him resulted from the instructions given to this group by FISK.
[…] Among the possessions of the deceased was the enclosed pamphlet entitled “Brainwashing A Synthesis of the Russian Textbook on Psychopolitics,” a copy of which is enclosed for the Bureau’s information.