Mordor Orcs were orc soldiers that worked for the evil forces of Mordor. They can be used by both the forces of Mordor and Angmar.
Orcs are the foulest creatures to walk Middle-earth. They are evil-hearted monsters that rejoice in slaughter and destruction. The Orc's natural aggression makes them the perfect tool of evil intent, their numberless hordes forming the core of the Mordor army. While they're individually cowardly, they gain strength through numbers - a mass of Orc warriors can be a terrifying sight for any enemy of the Dark Lord.- Games Workshop