The Denver Public Library's Genealogy Department is taking requests from "people wanting to get copies of documents detailing when and where police spied on them." Send them a request and they'll dive into fifty years of Denver Intelligence Bureau "spy files" and send you a redacted copy within 30 days.
The files came to be known as the Spy Files during the publicity surrounding an American Civil Liberties Union class action lawsuit in 2002. According to the lawsuit, as many as 3,200 individuals and 208 organizations had been targeted for intelligence gathering operations. These groups and individuals included not only criminal elements but also peace activists and education and human rights organizations. [Link]Of course, this could just be an ingenious plan to locate and surveil nefarious peaceniks, so proceed with caution.