Association of Minor League Umpires

Established in 1999, the Association of Minor League Umpires (AMLU) is a national labor union that represents professional baseball umpires working in Minor League and Major League Baseball throughout the United States and Canada.

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.

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