According to David Mayo, who was Hubbard's personal auditor and research assistant in 1978, it was Hubbard who changed the upper grade chart.
I remember those people who had a certain aura about them back in the day when there were OT 6s and OT 7s, and only one level to go before having Total Freedom and Total Power at (old) OT 8. Being "OT" gave them a mystique, that and their having done lots of TR 0 made them seem special, especially to an eager novice like me.
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I'll repost some things just for the heck of it. They includes a link to an article from 1989, by David Mayo, on 'Clear'.
Scientology had its period of greatest expansion during the psychedelic era.
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David Mayo
Excerpt from the 1989 David Mayo article on Clear. http://www.ivymag.org/iv-01-02.html (David Mayo is an Ex Scientologist, Class XII and former Senior C/S International, who knew Hubbard on the ship and, for a time, around 1978, lived at Hubbard's residence and worked with Hubbard):
"It was PR and marketing considerations that led Hubbard to decide that certain people were 'clear' at a certain point..."
And from author
Russell Miller's interview of David Mayo from August 1986.
http://www.cs.cmu.edu/~dst/Library/Shelf/miller/interviews/mayo.htm
"What worried me was that I saw some things he did and statements he made that showed his intentions were different from what they appeared to be... He told me he was obsessed with an insatiable lust for power and money. He said it very emphatically. He thought it wasn't possible to get enough. He didn't say it as if it was a fault, just his frustration that he couldn't get enough."
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Background
"This is a cold blooded and factual account of your last sixty trillion years," from the 1952 book, 'History of Man', found Hubbard telling others the contents of their minds, but it was premature "mind grope," just as the early 1950s e-meter reactions projected on the wall with shadows, while the audience went "ooh!" and "ahh!", was premature "Your e-meter will tell you"-ism, and the 1951 "no rights of any kind" was premature SP Doctrine, and the 1951 "dispose of quietly and without sorrow" was premature Fair Game Law and premature disconnection - disconnection in its most extreme form.
It was too early for the implementation of these ideas on the still small, fragile and tentative membership. That would need to wait for a decade, as would Hubbard's implementation of most of the ideas outlined in the "enigmatic" (fraudulent) "Russian Textbook on Psycho-politics."
In the mean time, Hubbard surrounded himself with those excited about his much advertised vision of a better world, and excited about the full releasing of spiritual ability.
Hubbard liked to write and he liked to lecture, and he had a knack as a practical psychologist. He drew on the ideas and innovations of the most creative of those around him, and drew on his own knowledge of abreaction (catharsis, "get it [buried thoughts and emotions] off your chest") therapy.
Movie scene illustrating a cult leader taking control of an other's mind by manipulative and exploitative use of catharsis.
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Utilized also was Korzybski's General Semantics with its "earlier similars," etc,
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and Aleister Crowley's Magic(k).
See Hubbard's "loose lipped" Philadelphia Doctorate Course of 1952, specifically lecture 18 (and other lectures), for his references to Crowley.
Hubbard re-worked the (four 'letters' - ingredients - of the) Kabbalistic 'tetragrammaton', and it became his 'Four Conditions of Existence'. Hubbard rewrote Crowley's 'Naples Arrangement' and it became his 'The Factors'. He borrowed Crowley's idea of a multiplicity of infinite minds and further excited Scientologists with that notion. None of these were original with Crowley, who was as much a relay point as was Hubbard. Yet, unlike Crowley, Hubbard would eventually incorporate the methods of psychological warfare into his system, and used those methods, not only on his perceived enemies, but on his own followers.
And when he finally - in the mid 1960s - unleashed, mostly covertly, the psychological warfare methods of the "Russian Textbook" on Scientologists, he also returned to fully utilizing those ideas he had briefly tested more than a decade earlier.
He gave them a past, he gave them a future, he told them the contents of their own minds, and made it plain that only HE knew, and others were going to be told.
Scientologist were overjoyed as they knew that "Total Freedom" and "Total Power" awaited them.
Hubbard had written confidentially of the importance of "using enemy tactics,"
and would even use those "enemy tactics" on his own loyal followers. He had written of psychiatrists in August 1963:
"Psychiatry is authoritarian and tells the person what's wrong with him, often introducing a new lie. Scientology finds out what's wrong with the person from the person."
Soon to follow would be the secret and very serious, and very dangerous, and vital to your survival "Clearing Course," "OT 2" and "OT 3," in which Hubbard would do what he said the psychiatrists did.
(The science fiction aspect of these materials has drawn the most attention but, perhaps, more important was the switch from (seemingly) harmless pop psycho-therapy to covert hypnosis.)
Hubbard had done this in 1952, but now it was formalized and institutionalized, and a senior part of the doctrine of Scientology doctrine.
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Concise look at the multi-layered Chinese finger puzzle of Scientology"
Ex Scientologist - The Scientological Onion with a link to what has been called the "blueprint for Scientology."
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Music by the Incredible String Band before they became Scientologists. They have since become ex Scientologists.