American League and National League umpires form a new Association of Major League Umpires. They threaten to strike in the spring of 1969 unless Al Salerno and Bill Valentine are reinstated by the AL.

This Day In Baseball

On September 30, 1968 — American League and National League umpires form a new Association of Major League Umpires. They threaten to strike in the spring of 1969 unless Al Salerno and Bill Valentine are reinstated by the AL.

 

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Sources:
Baseball Reference September 30
National Pastime September 29
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game