B. asks: “How long is brainwashing effective, and how can it be maintained?”
The Manchurian Candidate by Richard Condon
as well as the 1962 and 2004 film adaptations
The Wrong Way Home: Uncovering the Patterns of Cult Behavior in American Society Arthur J. Deikman, M.D.
A Clockwork Orange by Anthony Burgess
and the film adaptation
Stephen R. Donaldson’s The Gap Cycle
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I’d recommend: Combating Cult Mind Control by Steven Hassan (a former member of the “moonies”). It’s good.