Related Clues:
- Boo targets, often
- Sports people in masks
- Baseball officials
- 42-Down callers
- Visitors to Vail
- They know when you're out
- Court judges
- Softball officials, briefly
- Time callers
- Ballpark figures?
- Hall-of-famers Bill Klem and Nestor Chylak, e.g.
- Foul callers, briefly
- World Series workers
- They make judgment calls
- 'Steee-rike!' callers