What Is the Most Evil Government in Science Fiction?

Big Brother. The Empire. The Borg Collective. Lord Business. Science fiction is brilliant at conjuring up evil governments and authoritarian dictators that would seem ridiculous if they didn't strike so close to home. What science fictional government scares you the most — either because it's realistic, or just plain horrible?

Please include pictures, video, or links to enhance our feeling of oppression, erm, I mean our happiness in a world where we are free to labor harmoniously!