The Death Eaters claim to believe in the superiority of pure-blood wizards over half-blood wizards and muggles. As such, their main goal is to establish a new world order through violence that would put pure-bloods at the top of the social structure and eliminate or enslave what they perceive to be “lesser breeds” of humanity.
If you take away the “magic” context, the Death Eaters’ doctrine sounds eerily similar to the Nazi philosophy of the superiority of the Aryan race over all other races. While it might seem like J.K. Rowling, the creator of “Harry Potter,” was inspired by Nazi propaganda while crafting the main villains of her series, Rowling has actually stated that she did not consider the similarities until after creating the Death Eaters, when she visited a holocaust museum.
‘I saw [Nazi propaganda charts] in the Holocaust Museum in Washington when I had already devised the ‘pure-blood,’ ‘half-blood’ and ‘muggle born’ definitions,” Rowling explained in a blog post. “[I] was chilled to see that the Nazis used precisely the same warped logic as the Death Eaters.” Of course, as the leader of the Death Eaters, Voldemort shares more than a few similarities with Adolf Hitler, although the Dark Lord himself would doubtless scorn the idea of being inspired by a muggle.