yelling during a pitch in slowpitch SB

[rwest]

Our association had a situation similar to the one described except it involved a "spectator". He was a player for one of the teams and had been suspended for the rest of the season. However, since it is a public park, we can't prevent him from being at the game. He was obnoxious and would make loud sounds as the opposing pitch delivered the ball. I was playing on another field and not umpiring that night. The field manager asked him to quiet down.

What recourse does an umpire have when dealing with unruly fans?