Well, I believe it can happen. Fast-forward some 20 years in the early 90s and I've seen the facts with some people I knew from their involvement in the metal scene. They even had targeted a cousin of mine as a potential victim; she was lucky to have escaped due to an unexpected voyage to Australia.
http://www.napanet.net/~moiraj/wwwbo...ages/1712.html
After their arrest there was suspicion that their behavior was somehow "programmed" by another secret cult of elders. Investigation was launched, local press was hovering over potential witnesses but mouths were shut and nothing surfaced on the trial.
I think in Europe as well, occult sects were kind of a trend during the early 70s.
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