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And I can't recommend this book enough.
Agents of Repression: The FBI's Secret Wars Against the Black Panther Party and the American Indian Movement
by Ward Churchill and Jim Vander Wall
http://www.southendpress.org/2004/items/Agents
http://www.amazon.com/Agents-Repression-Against-American-Movement/dp/0896082938
If nothing else, Ward Churchill did one right thing and the book is an excellent history of the FBI from it's early beginning as the morals police and how it transformed into America's political police.
This is a must read as well:
Threatening Anthropology: McCarthyism and the FBI's surveillance of activist anthropologists. (David H. Price, Duke University press, 2004)
http://www.aaup.org/AAUP/pubsres/academe/2004/SO/BR/gill.htm
This is Prof. Price's website
http://homepages.stmartin.edu/fac_staff/dprice/CW-PUB.htm
Now that RMP was kind enough to remind me of my advanced age, I notice my back is hurting and I think I will lay down.