MLB Umpires Association, adamant that crews are simply upholding

MLB to host Umpire Prospect Development Camp

Barksdale, Hoye, Iassogna and Porter will be the umpire crew chiefs for Wild Card Series

Joe West (umpire) - Wikipedia

MLB umpires to wear wristbands in protest of 'escalating verbal attacks' from players

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Why Jim Leyland Is Right: MLB Needs to Hold Umpires More Accountable, News, Scores, Highlights, Stats, and Rumors

Umpire (baseball) - Wikipedia

MLB, Official Information, Umpires