Related Clues:

• Wrigley Field corners
• Ones making calls, informally
• MLB arbiters
• "Strike!" yellers
• Major venues?
• Strike-zone arbiters, for short
• They're rounded after homers
• People working at home
• Baseball's 'men in blue'
• Baseball's "men in blue"
• Home squatters?
• Baseball arbiters, for short
• Sports officials in black
• Ones conducting home inspections?
• Foul ball callers