Anyone who, (a) has read the Harry Potter books, (b) has at least an elementary knowledge of politics and history, and (c) has an IQ above room temperature, should be able to figure out that Rowling clearly based Voldemort and his Death Eaters on Adolf Hitler and the Nazi party. Both want a totalitarian government, both wish to oppress, persecute, and exterminate those that they see as being born genetically inferior based on the "purity" of their blood. They blame all of their problems on a certain group of people. They manipulate school curriculum in order to indoctrinate children against this group. The "pure blood" motif is also very similar to the outdated British Nobility system, of which the few that remain still cling to.