The Stewards are the police force of the BNL starliner Axiom. They try to keep things in order aboard the ship. After WALL-E accidentally freed the malfunctioning robots from the Repair Ward, they chased after the "rogue robots". They considered WALL-E and EVE rogues as well.
Later, AUTO summoned all of the available Stewards to stop EVE and WALL-E from placing the plant in the Axiom's holo-detector, only for all of them to be destroyed by HAN-S.
However, not all of the Stewards were destroyed. When EVE broke out from the garbage disposal with M-O and WALL-E, they encountered a single Steward who was scared off by EVE and hid in a closet after taking a new picture of them. During the credits, a Steward (that could've been the one in the closet) was seen helping the other robots rebuild the city after the Axiom returned to Earth, likely implying that they had a change of heart, or that the ones who remained loyal to AUTO were destroyed or all of them were reprogrammed by the other robots or the crewmen.