Possible Clues:

• Wielders of the dark side of the Force
• Red lightsaber wielder
• "Star Wars" antagonists
• "Star Wars" baddies
• "Star Wars" enemy group
• 'Star Wars' villains
• 'Star Wars' order
• Evil sci-fi order
• "Revenge of the ___" ("Star Wars" film)
• Group that opposed the Jedi