Final answer:
A labor union is an organization formed by workers to protect and advance their rights and interests in the workplace, negotiate with employers, and improve working conditions.
Step-by-step explanation:
A labor union is an organization formed by workers to protect and advance their rights and interests in the workplace. Its purpose is to negotiate and bargain with employers on behalf of the workers to ensure fair wages, safe working conditions, and employee benefits. Labor unions also aim to improve the overall working conditions and promote unity among workers.
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