There is a new comprehensive book out about cults titled "Cults Inside Out: How People Get In and Can Get Out."
The book includes a history of cults, cult intervention work and how people can be "deprogrammed" out of the cult mind-set.
There are chapters on Scientology, Falun Gong, LGATs (large group awareness training e.g. Landmark Education the Forum), abusive-controlling cultic relationships, family cults, "cult brainwashing" and how to define a destructive cult. The book includes more than 1,200 footnotes an 18-page bibliography and extensive index. The book also includes case vignettes demonstrating how people break free from cults through family interventions.
There is a chapter regarding an Amway intervention that discusses multilevel marketing.