Chapotraphouse

Even the slug dudes you meet in the later games are the ones too inept to get a better posting on a planet that doesn't have a poisonous atmosphere.

According to Laidlaw, the Overseers aren't even the top ranks, they're just enslaved to be middle managers.

Though whether the "top ranks" even exist, or the whole thing is some sort of self-perpetuating rogue process is left ambiguous.