This is a quote from the book "The Gentleperson's Guide To Forum Spies" by Cryptome.org
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They use them.
Such tactics include slander, defamation, threats, getting close to dis
affected or minimally committed fellow activists to persuade them (via psychological tactics described above) to turn against the movement and give false testimony against their former compatrio
ts. They will plant illegal substances on the activist and set up an arrest; they will plant false information and set up "exposure," they will send incriminating letters [emails] in t...