A labor union job is either a job in which you work for a labor union or in a position that is represented by a union. A labor union acts as a representative for workers when they negotiate with the business that employs them. If you work for the union, your duties are to advocate on behalf of the members when it comes to general issues, such as salary, safety, and labor rights. Unions exist in different industries and represent members in a specific trade or closely related professions. Jobs that often have union representation include construction, manufacturing, transportation, and infrastructure workers, law enforcement professionals, firefighters, government workers, educators, and performers.