Physical retribution isn't too much of a worry as far as I am concerned. They tend to get legally antsy, though. Mind you, you need to do something significant they they feel the need to come after you for. Not worth worrying about at all.
If you want to do something, perhaps you could show people the France 3 documentary that effectively shut them down in France? They've tried t
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Large Group Awareness Training, "Human Potential"