MLB appoints 1st black umpire crew chief
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MLB Umpire Bios
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50 years ago today, the Pittsburgh Pirates fielded MLB's first all Black starting lineup. : r/baseball
The League' Review: Sam Pollard's Excellent Negro League Baseball Doc – The Hollywood Reporter
MLB names first Black and Latino born umpire crew chiefs – Pro Player Insiders
MLB appoints first black and Latino-born umpire crew chiefs
Inside Baseball's Desperate Effort to Save Itself From Irrelevance - The Atlantic
Umpire Angel Hernandez loses racial discrimination lawsuit against MLB