As president of the United Phoenix Firefighters Association for more than 20 years, Pat Cantelme turned the union into a political force — and, in the process, made it one of the most powerful labor groups in this right-to-work state.

But Cantelme is now on the other side of the negotiating table. He's part owner of a privately held ambulance company, Professional Medical Transport, or PMT.

And PMT, as I learned recently, has a big union problem. (More)