Beyond the grunt: Umpires mic up, and baseball changes a bit
MLB umpires wear white wristbands against player abuse
MLB umpires wear wristbands to protest 'abusive player behavior
COMMENTARY: Umpires should never make a statement during a game - Hamilton
MLB umpires wear white wristbands against player abuse
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League Rules
Umpires
Kinsler, Ausmus respond to umpire protests
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Umpires Wear Wristbands to Protest 'Abusive Player Behavior' - The New York Times
Umpires end protest after MLB commissioner agrees to meeting
MLB umpires wear wristbands to protest 'abusive player behavior
Umpires
Joe West wears armband to protest verbal attacks on umpires, stares down player when calling strikes outside strike zone