Conversation so far:
What is the pine tar incident with George Brett?
In The Pine Tar incident with George Brett, Yankees manager cited a rule that any foreign substance on a bat could extend no further than 18 inches from the knob.
What happened after the Yankees manager Billy Martin cited a rule that any foreign substance on a bat could extend no further than 18 inches from the knob?
The umpires measured the amount of pine tar, a legal substance used by hitters to improve their grip, on George Brett's bat; the pine tar extended about 24 inches.
What did the umpire do after Yankees manager Billy Martin cited to the umpires a rule, stating that any foreign substance on a bat could extend no further than 18 inches from the knob?
The home plate umpire, Tim McClelland, signaled George Brett out, ending the game as a Yankees win.
What did George Brett do after the home plate umpire, Tim McClelland, signaled Brett out, ending the game as a Yankees win?
George Brett charged out of the dugout directly toward McClelland, and had to be physically restrained by two umpires and Royals manager Dick Howser.
What were the consequences after Brett charged out of the dugout directly toward McClelland, and had to be physically restrained by two umpires and Royals manager Dick Howser?
The Royals protested the game.
What was the resolution to the Pine Tar incident with George Brett?
American League president Lee MacPhail upheld the protest, that the bat should have been excluded from future use, but the home run should not have been nullified.

Question: What was the impact?
Self-contained rewrite: What was the impact of the protest after the Pine Tar Incident with George Brett?