Related Clues:

• Half the population
• The ''M'' of ''MIB''
• They're moved at a 17-Across
• 19th Amendment beneficiaries
• Troopers
• Former boys
• Checkers
• Word on some doors
• John's sign, sometimes
• Crew
• Some males
• Old boys?
• "__ in Black"
• NFL players
• Sirens, for example