Related Clues:

• The 'U' in A.C.L.U.
• Word with ''jack'' or ''label''
• Official in black
• It may be striking
• See 8 Down
• Collective bargaining group
• Official behind a catcher
• Diamond ref
• 1865 victors
• Man in blue, often
• Authority behind home
• Stars on the flag
• Ref's colleague
• Masked one at home
• Oft-booed official