According to Albus Dumbledore, the Death Eaters in Harry Potter have always been "a motley collection" of wizards and witches, "gravitating toward a leader who could show them more refined forms of cruelty." Voldemort ensures their enduring loyalty by promising them the world, while simultaneously threatening them with dire consequences if they even dream about leaving his service.
Source：https://www.cbr.com/harry-potter-death-eater-darkest-actions/
