Earlier on this thread discussion took place about the chance that BK might have read Ken Keyes books while in the halfway house.
Be that as it may, on the Wikipedia page for Ken Keyes, there is this
.
Keyes died in 1995
Quote)
Ken Keyes, Jr. (January 19, 1921, Atlanta, Georgia – December 20, 1995, Coos Bay, Oregon) was a personal growth author and lecturer, and the creator of
Forum:
"Cults," Sects, and "New Religious Movements"