Scientologists, Satanism and The Manson Family
The Process Church of the Final Judgment, commonly known as the Process Church, was a religious group established in London in 1966. Its founders were the British couple Mary Ann MacClean and Robert de Grimston and it spread across parts of the United Kingdom and United States during the latter 1960s and 1970s.
The Process Church was established by MacLean and de Grimston in London in 1966. The pair had met several years previously, when they were both members of the Church of Scientology. The duo were ejected from the Church in 1962 and married the following year. They started a Scientology splinter group called Compulsions Analysis, which gained new religious elements and developed into the Process Church. Its members initially lived in a commune in Mayfair before moving to Xtul in Mexico's Yucatan peninsula. They later established a base of operations in the United States in New Orleans. Prosecutors investigating the Los Angeles murders committed by the Manson Family in 1969 suggested that there were links between Charles Manson and the Process Church. Although no proof of such a connection was ever provided, the allegations damaged the Church's reputation.
In the early 1970s, the sociologist William Sims Bainbridge studied the group, producing an in-depth account of its activities. In 1974, MacLean and de Grimston separated. The latter tried to continue the group with a small following, but this folded in 1979. MacLean retained the allegiance of the majority of Church members, reforming the group as the Foundation Church of the Millennium and taking it into an explicitly Christian direction. It was later transformed into the Best Friends Animal Society, based at Kanab, Utah.
https://en.wikipedia.org/wiki/Process_Church_of_the_Final_Judgment
The Process held that God is made of four separate parts equally worthy of worship – Jehovah, Christ, Lucifer and Satan — and that a person must worship all four in succession to gain enlightenment.[4] Their newsletter was in vogue during the era of flower power, and featured articles about the Rolling Stones, Charles Manson and the like.[4]
https://en.wikipedia.org/wiki/Robert_de_Grimston