Let me tell you what you probablly already know. There is not much difference between the union and the company, pigs in a basket. There is a smybotic relationship between the union and the company. If the company does good, then more people are hired and pay -money- dues to the union. Money is power because you know that unions just love to give your hard earned money away. Spending other peoples money is an aphrodiciac to them.
The duty of fair representation is the legal duty of a union to equally, and in good faith, represent every employee in a bargaining unit, regardless of whether the employee is a union member or not.
This legal duty arises out of the exclusive representative status unions hold under the National Labor Relations Act in the private sector and under state collective bargaining laws in the public sector.
The duty requires three things on the part of the union: all members' interests be served without hostility or discrimination; that discretion be exercised with good faith and honesty; and that the union not act arbitrarily.
If you have been harmed, -loss of money is harmed- then you just may be on solid ground to file a grievance. Good luck TL