Mafia style corruption

I got a real problem with my union and the call steward dispatching department. There are certain union members that volunteer/help out with dispatching calls to the union. They were given access to the dispatching system because they are members and call stewarding is always very busy. These people started dispatching themselves and not going by seniority. They even dispatch themselves for the premium gigs like those 5 day workweeks while union members with higher seniority are slumming for 4 hour load in and load outs like me. I know there are seniority dispatching exceptions like skills and schedule but that’s not what’s happening. This has been going on for years and I am finally realizing this myself. I’m contemplating how to report this or to who and what arguments I can use to debate this like labor laws or collective bargaining agreements. This is a big deal and don’t want to drop names or union numbers…