Related Clues:

• Ones crying foul?
• Rulebook pros
• Rink whistle-blowers
• Works the game
• Striped whistleblowers
• Zebras at Lions games?
• Foul rulers
• Certain Y volunteers
• Officiates
• Flag tossers, informally
• Some coin tossers
• Court officials, for short
• Penalty callers, for short
• Court arbiters
• Touchdown signalers