Stewards
Concept · Stellaris 4.5.2
Stewards in the Stellaris encyclopedia: Stewards turn Consumer Goods into Unity, Trade, and Amenities
Stewards in the game's words
The encyclopedia entry as the game shows it in its tooltips; underlined words open their own entry or page here.
Stewards turn Consumer Goods into 
Unity, Trade, and Amenities
These democratically-elected volunteers ensure the smooth running of our cooperative society, for the benefit of all its members.
Source: common/game_concepts (concept_steward) and localisation/english, Stellaris Cygnus v4.5.2 (9776).