The Zygerrian Slave Empire was the monarchist corporatist empire of the Zygerrians species based on Zygerria that had holdings from Outer Rim to Wild Space. Thousands of years ago, the Jedi of old put a stop to the slavery that the Galaxy endures. However, by the time of the Clone Wars, the slave empire was restored by the Confederacy of Independent Systems and they laid waste to the Togruta race, but were saved by the Galactic Republic, especially Anakin Skywalker, Ahsoka Tano, and Obi-Wan Kenobi.
However, as seen in The Bad Batch, the slave empire continued to thrive, especially during the Galactic Civil War.