I just finished watching The Internet's Own Boy, the documentary detailing the life and tragic death of one of, in my opinion, America's great activists. Long story short: watch this documentary, really, just do it. It's licensed under Creative Commons BY-NC-SA so torrent it if you want.
Then, when you are sufficiently riled, and fed up with the way our government pursues "justice", donate to The Mayday PAC. I did. It's still accepting donations and they need support.