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The Liberated were members of an alien race who, as members of the Dominion, served the Founders as guards of prison facilities.
In 2373, the Liberated entered the Alpha Quadrant through the Bajoran wormhole and sieged Deep Space 9. The reason for their attack was to obtain an Orb to contact the Prophets. (DS9 - Rebels novels: The Courageous, The Liberated)