“The unions don’t have to represent the non union workers. The companies they work for pay their benefits not the unions.”
The union do represent all members of the bargaining unit whether they are members of the union or not. The collective bargaining agreement covers all members of the bargaining unit. Non-union members covered by a collective bargaining agreement are subject to the terms of the agreement as are the union members. Non-union members cannot for example go to management and negotiate their own terms of employment if they are covered by a contract.