Striking out: Players on independent teams, like Barnstormers, left out as those on 'affiliated' squads join MLB union, Lancaster Barnstormers
More Than Baseball Nonprofit organization
MLB players' association trying to unionize minor leaguers
Why the MLBPA is pushing to unionize minor league players
Here's Why An MLB Minor Leaguers Union Matters
Texas Rangers to sell Hickory Crawdads team to New York company
Not all PA teams included in minor league baseball union
Baseball: MLB lockout begins as owners and players remain at impasse
Major League Baseball's 'Working Poor': Minor Leaguers Sue Over Pay
Minor League Baseball players ratify historic first CBA; deal includes salary increases, more
How MLB lockout affects QC River Bandits, minor league baseball
MLB is ready to recognize a minor league union : NPR
Minor league baseball players to lose minimum wage protection, Aviators/ Baseball
Basic truth behind low salaries of minor leaguers - NBC Sports