Browns are a lower level Color.
They are servants in homes, businesses, and social institutions. They are often seen as attendants, cooks, janitors or nannies, and are unnoticed by the people they serve. They have also been depicted as having other tasks, such as being bodyguards for Mickey, a violet carver, or as an assassin for the Barca family in Iron Gold.
There are no named Browns in the Red Rising Trilogy.