
Association of Minor League Umpires
Office and Professional Employees International Union
Guild 322
AMLU is the exclusive recognized bargaining agent for all professional minor league baseball umpires across the United States and Canada.
Founded in 1999, AMLU has fought to improve the lives, wages, and working conditions for minor league umpires and has fought to uphold the integrity of the game of baseball.
Association of Minor League Umpires
The Association of Minor League Umpires (AMLU) was formed in 1999. AMLU is a national labor union that represents professional baseball umpires working in Minor League and Major League Baseball in the United States and Canada.
In 2010 AMLU members voted to affiliate with Office and Professional Employees International Union. OPEIU is a diverse white-collar and professional based union representing over 125,000 employees in various industries.