Slaves make up the majority of Menzoberranzan’s population. These lowly folk are non-drow that have either been captured in the Underdark or specifically bred into a life of service.
No drow citizen of Menzoberranzan is ever officially the slave of another drow, but some are slaves in all but name other drow taken as captives during a battle outside the city can be brought back and held openly as indentured servants.
Non-drow are typically referred to as colnbluth, or undercreatures, by Menzoberranyr. The most common kinds of slaves include goblins, kobolds, orcs, hobgoblins, and bugbears, though more exotic varieties certainly exist. Each slave is afforded a place according to its talents. Most are laborers, farmers, and house servants. Those with fighting skill end up as expendable first-line defenders in house armies.