On August 25, 1978 — Major League umpires stage a one-day strike in defiance of their contract, in order to gain recognition for their union as their bargaining agent with Major League Baseball. Semipro and amateur umps are pressed into service until a restraining order forces the strikers to return. The umpires will walk out again at the beginning of the 1979 season.
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Sources:
Baseball Reference August 25
National Pastime August 25
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game