By Federal and state laws, unions are required to equally represent all employees in a bargaining unit whether or not they are dues paying members. Every benefit and right contained in the union contract must be extended to all employees. The union must spend its members' resources on employees regardless of whether they pay their fair share of the expenses.
In the public sector, employees generally pay a "fair share" fee instead of dues. For the past 40 years, Federal law has allowed union contracts to contain a requirement for fair share fees. This doctrine is now at risk in a case before the U.S. Supreme Court titled Janus v. AFSCME.
The backers of this case are among the most anti-worker and anti-union organizations in the nation. They want to drastically weaken the finances of the public unions where a majority of U.S. union workers reside.
Bargaining units are formed by a majority vote of the workers. Not wanting to pay a "fair share" is like saying 'I don't like my member of Congress even though a majority voted for him/her. So, I'm not paying any taxes, but I still demand all my government services.
The Janus case is part of an attack on all unions and worker rights.