Gawker:

The FBI conducted a three-year investigation, dubbed "Seizing Thunder," into a animal-rights and environmental "terrorists" in the Pacific Northwest that devolved into widespread—and seemingly pointless—surveillance of activists for no apparent reason aside from the fact that they were anarchists, or protested the war in Iraq, or were "militant feminists." Here's the file.

You can read about Seattle's experience with similar shenanigans—though that's really too nice a word for law-enforcement activities that flirt with violating basic constitutional rights—here.