Minor League Baseball

"In 1902, the National Association of Professional Baseball Leagues was formed as an umbrella organization for minor leagues. An agreement between the major leagues and the new minor league association was written. The new document established league classifications, roster and salary limits and a system for drafting players. It recognized reserve lists and created a Board of Arbitration that was given the power to suspend players, clubs, or officials for violations. Patrick Powers was elected first president. The organization changed its name Minor League Baseball in 1999 (often abbreviated MiLB). In 2021, the venerable organization was in effect abolished, being replaced by a new structure, the Professional Development League."--https://www.baseball-reference.com/bullpen/National_Association_of_Professional_Baseball_Leagues