> People are not forced to join unions.
This is completely false. People absolutely are forced to join unions.
Furthermore, the overwhelming majority of union members - over 90% - never voted in a certification or authorization election. That means that, even if they're members of the union, their membership cannot in se be considered an endorsement of the union by the bargaining unit. Because it's all-but-impossible to successfully decertify a union in practice[0], it's not uncommon to have the majority of employees oppose union membership, but still be compelled into membership.
> They are, for the time being, in some states required to pay for fair share dues to cover the costs of collective bargaining, grievances, and other administrative costs
People within the bargaining unit are usually forced to pay dues whether or not they are members.
[0] The NLRB has the power to overturn the results of decertification, and a very strong incentive to do so. In addition, unions have learned that they can change the definition of the bargaining unit after an election is held in order to invalidate the election retroactively.
