A trade union is an association created up of members (a membership-based organization) and its membership must be made up primarily of workers. One of a trade union's main objectives is to protect and advance the interests of its members in the workplace. Most trade unions are independent of any employer.
There are multiple types of unions, including health care, public sector, construction, writing, and service employees unions, and they represent a variety of professions, such as nurses, journalists, manufacturers, construction workers, municipal workers, and hotel workers, to name only a occasional.
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