In Harry Potter and the Order of the Phoenix we're introduced to a new evil character: Dolores Umbridge. Professor Umbridge isn't in love with a particular belief system or an ideology. We mean, yes, she does believe that humans should be at the top of the magical hierarchy. But besides that, she doesn't seem that committed to a single idea. What she is in love with is power. There is nothing she enjoys more than demonstrating her power over other people. The thing that's interesting about Professor Umbridge's love of power is that she doesn't even have to work for Voldemort. By struggling for authority, she becomes so selfish that she empowers people like Draco, Crabbe, and Goyle, who are more closely connected to Voldemort. Professor Umbridge may not actively support Voldemort, but does that matter? Her persecution of Harry and Professor Dumbledore because they are threats to her power does Voldemort's work for him.