They started a brief Scientology splinter group named Compulsions Analysis, which incorporated new religious elements; this developed into the Process Church, which was established in London in 1966.
Its members initially lived in a commune in Mayfair, West London before moving to Xtul in Mexico's Yucatan peninsula.
Authors who have written about the group include Ed Sanders, journalist Maury Terry, and in the early 1970s, the sociologist William Sims Bainbridge.
Various accounts have said that she had spent a year in the United States, had a relationship with the boxer Sugar Ray Robinson, and worked as a high-end prostitute in London, servicing prominent figures in British business and politics.
[4] Moor distinguished the methods of Compulsions Analysis from Scientology in that it did not claim that its benefits were "infinite", stating that "we are not offering super powers, but a means that people can live on this side more effectively".
[8] In March 1966, twenty-five members of the Process moved into a commune at 2 Balfour Place in Mayfair, an affluent area in the West End of London.
[8] They found a location known as Xtul; its name meant "the end" in the Mayan language, and the group took this as a portent that they should settle there.
They faced opposition from both locals and from the parents of several Church members, who enlisted anti-cult groups to try and recuperate their children through legal means.
[9] It was while there that the group clarified its hierarchical structure, with the De Grimstons at the top, who were referred to as "the Omega", followed by those regarded as masters, then priests, then prophets, and finally "messengers".
[10][11] In late September, a tropical hurricane devastated their settlement, and while some of them elected to stay, the De Grimstons and most of their followers decided to leave.
In 1967 and 1968, the De Grimstons made various further international travels, spending time in East Asia, the United States, Germany and Italy; in the latter they visited the ruins of the Abbey of Thelema on Cefalu, the commune established in the 1920s by British occultist Aleister Crowley.
[12] One could make the argument that due to its extreme views and insular arrogance, The Process Church had itself to blame for the smears and resulting hysteria.
[25] By the late 1970s—when the Church itself had disbanded—it was common for anti-Satanist literature to allege that Manson was a member of the group and that both were linked to blood sacrifices.
[27] Journalist Maury Terry linked the Process Church to Ordo Templi Orientis and claimed both as part of a grand Satanic conspiracy in his 1987 book The Ultimate Evil.
[29] A detailed account of the history of and life within the Process Church as told by a participant-observer is contained in William S. Bainbridge's book Satan's Power.
[14] De Grimston took a minority of the group members with him, seeking to continue the Process Church in a manner akin to his original form, although abandoned the project in 1979, when he moved professionally into business.
"[2] The group defined itself as "a Christian church" which required its members to believe in the Trinity, the divinity of Jesus Christ, and his second coming.
[2] Like the Process Church, membership was organised according to a hierarchical system of degrees, and it was led by a nine-member Council of Luminaries.
[2] In 2004, a feature article in Rocky Mountain News publicly revealed Best Friends' origins in the Process Church.
[32] In 2005, MacLean died, and the management of her charity was left to her second husband, Gabriel De Peyer, a former Foundation Faith of God Church member.
[10] There has been some debate as to whether to categorise the Process Church as a form of Satanism or not; the anthropologist Jean La Fontaine noted that it was "difficult to decide whether it was a truly Satanist organization".
"[37] Moor taught the real "devil" was humanity or the "Grey Forces", which were understood as representing the compromise and conformity typical of the masses.
[30] Among group members, sex and the use of drugs and alcohol (with the exception of caffeine and nicotine) were strictly rationed, with these practices being regarded as a distraction from spiritual work.
[16] The Church held public rituals similar to Christian practices, such as baptisms, marriages and a weekly gathering titled the Sabbath Assembly.
)[40] Industrial music group Skinny Puppy released an album titled The Process that contained lyrics espousing anti-vivisection themes.
[38] The Process Church's rituals were later adopted and utilised by the band Psychic TV and the group that formed around it, Thee Temple ov Psychick Youth (TOPY).
[43] Alessandro Papa founded the New Processean Order in Italy 2014 by recording the album Hymns to the Great Gods of the Universe with invited friends and guest artists.
Integrity founder Dwid Hellion founded The Holy Terror of the Final Judgment label, releasing music by many bands influenced by the Process.
Holy Terror and associated artists include Integrity themselves (who released the album Humanity is the Devil based on Process Writ in 1996), Gehenna (band), Rot In Hell, Psywarfare, Lay It on the Line, Ringworm, Sutekh Hexen and others.
It was published as Love, Sex, Fear, Death: The Inside Story of The Process Church of the Final Judgment by Feral House in 2009.