Ugnaught

Ugnaughts were goblinoid trolls from the planet Gentes, where they were possibly grown in vats by Darth Saruman. They were industrious Morlocks who loved working in dark, underground, dangerous factories.

General Grievous invaded their homeworld and took almost the entire population as slaves to work in the droid foundries on Geonosis. Pointless, really... they probably would have worked voluntarily, if he'd only had the decency to ask.

Lando Calrissian famously had some Ugnaughts working for him at Cloud City. But Lando would never take them as slaves. Instead, he generously had them working for minimum wage and living in grime-covered slums somewhere deep in the bowels of the city, where there were no windows and they could not see the sky. After Lando left, Cloud City was taken over by the Galactic Empire and put them all back in slavery again, and a resistance movement was organized by King Ozz... the great and powerful!