Considering that the Union is always the only entity entitled to negotiate for the employees, does this change your view?

Collective Bargaining through a Union of the employees is a well-established labor right in the United States gained through the Fair Labor Standards Act (which governs such bargaining). Although this federal statute compels employers to allow unions to form among the employees if the employees so choose, there is no absolute requirement in every state that an employee must join the union if their employer does, in fact, have a union. Some states do make union membership mandatory of all employees if such a union exists (and thus union dues are also mandatory for such employees); other states known as “Right to Work States” allow employees to opt out of union membership despite the fact that such employees are still entitled to any benefits gained by union negotiations. These employees are called “Free Riders”. Which practice is more ethical? Which is more practical? Considering that the Union is always the only entity entitled to negotiate for the employees, does this change your view?