An umpire can request game management remove a fan and not start the game until it has been done. It happened three times this year in high school here during our games. 2 of the three were for cursing toward umpires or players. The other was a threat toward a player. In high school, the umpires have control of the field once they walk on it until they walk off it. They can decide when a game continues. I saw a college umpire remove a fan this year from the stands for cursing player and opposing coach directly.