If, in fact, the founder of the Ishayas is Vaughn Abrams - here's the little historical information that I know about him (his face on the Ishaya website looked vaguely familiar)
If my memory serves me right, (I claim protection of perimenopausal memory lapses)
In about 1980 or so, Vaughn and Del Abrams, with I think 2 young children, built a home south of Fairfield Iowa (TM mecca) on Gl
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"Cults," Sects, and "New Religious Movements"