The union member who is elected by members to represent their interests with management is the union:

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A steward is a union member who is elected by other members to represent their interests with management. They act as a liaison between workers and management, and are responsible for ensuring that the collective bargaining agreement is followed. They also investigate grievances, represent workers in disciplinary proceedings, and work to ensure that the workplace is safe and healthy.

The Union Member Who Is Elected by Members to Represent