This is a quote from the book "The Gentleperson's Guide To Forum Spies" by Cryptome.org
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1) To disrupt the agenda
2) To side-track the discussion
3) To interrupt repeatedly
4) To feign ignorance
make an unfounded accusation against a person.
Calling someone a racist, for example. This tactic is used to discredit a person in the eyes of all other group members.
Some saboteurs pretend to be activists. She or he will ....