Enslaved peoples were those races that had fallen under the sway of the evil spirits Morgoth and Sauron, also known by the Free Peoples as 'Servants of the Enemy'. They included Orcs, Trolls and Men. The origin of Orcs and Trolls is unclear, but they were races that were taken by Morgoth and corrupted through sorcery into their final evil nature and appearance. Men were rarely corrupted by Morgoth or Sauron in the same way. Rather, their hearts and minds were corrupted by power and evil impulses, while they retained the physical appearance of men. Prolonged service to Sauron however, did turn the bearers of the Rings of Power from Men into the wraith-like Nazgûl. Those men who were the servants of Morgoth or Sauron were mostly from the east and south of Middle-earth.