No, Miller is not part of the Union.. Here is a very good article from 2002 about it.. http://espn.go.com/magazine/kurkjian_20020829.html Miller, the catcher for the Diamondbacks and one of the leaders of the team, doesn't consider himself a replacement player. He played in one "B" game that spring because he was told by his team at the time, the Twins, that he would not be punished by participating. Yet, to some degree, he still is being punished. His name was not included on the Diamondbacks' T-shirt celebrating the team's National League West title in 1999, nor on the T-shirt commemorating the 2001 World Series championship. When the Diamondbacks have met on union matters, Miller would leave the room and sit in the manager's office. How uncomfortable is that?