MLB Players Association takes 'historic' step toward unionizing
Baseball strikes and lockouts: A history of MLB work stoppages
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Bethel Park pitcher makes MLB debut, Sports
M.L.B. Players Association Working to Unionize Minor Leaguers - The New York Times
Largest Free Agent Contracts in Tampa Bay Rays History - DRaysBay
The history of the MLBPA, part one: The rise of sports' strongest union - Beyond the Box Score
Tony Clark talks MLBPA's push to unionize minor league baseball - Sports Illustrated
Unionizing the minor leagues could reshape baseball - The Washington Post
MLB Players Association rejects MLB international draft proposal - Los Angeles Times
How Minor League Ballplayers Won a Union
Why baseball's next unionization effort could come from MLB front offices: 'We're not protected at all'