The COINTELPRO Papers by Ward Churchill and Jim Vander Wall is essential reading for all activists. What the G-men have done before, they will do again. The Occupy movement is already infiltrated by local, state and federal agents. Paranoid conspiracy theory, you say? Bullshit, read this article and see for yourself: http://mrzine.monthlyreview.org/2011/levich221111.html
Then, get your hands on this book and learn all the shady, subversive, disrupting tactics that government agents have used to bust up Leftist movements in the past. Again, what they have done before they will surely do again. Why? Because it worked like a charm. Arm yourself and your comrades with the power of information.