A union representative is an employee of an organization or company, who represents and defends the interests of her/his fellow employees but who is also a labor union official. Does this help ? :)

In Australia and in most of the western world, almost all workers belong to unions ; police, teachers, nurses, shop assistants and so on. They have regular meetings about working conditions and pay. A union rep is a person elected by the workers to voice their concerns to the management and take their concerns to the president of their particular union. Sometimes workers go on strike for better pay.