Not a survivor of TWI myself but at my first job in 1979-1981 there were two women involved with it. They tried to recruit me but I am Catholic and I knew it wouldn't be compatible with my religion. One of them was deprogrammed by her parents. It's a corrupt organization like any cult, and I hope you get justice for the person. Strangely enough, I had been thinking about those events and wondering if TWI even still existed. I did some Googling, and found someone wrote a book published in 2017. Perhaps it would aid your investigation. https://www.amazon.com/Undertow-Escape-Fundamentalism-Control-International/dp/0997874708