Laborers
Concept · Stellaris 4.5.2
Laborers in the Stellaris encyclopedia: Laborers turn Minerals into Consumer Goods and Alloys
Laborers in the game's words
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Laborers turn 
Minerals into Consumer Goods and Alloys
As assets they were worked to the bone. With freedom has come renewed purpose, and a vigor that no slave could ever hope to match.
Entries that mention Laborers
Source: common/game_concepts (concept_low_tech_laborer) and localisation/english, Stellaris Cygnus v4.5.2 (9776).