Related Clues:

• 'Ball!' callers
• Judges
• Calls
• Strike callers
• Some whistle blowers
• Ballpark figures
• N.B.A. personnel
• Court figures
• See 58-Across
• Makers of calls
• Makes the calls
• They may stop the fighting
• Court V.I.P.'s
• Zebras on the gridiron
• They make a lot of calls