Conversation so far:
What was the Pine Tar incident?
The umpires measured the amount of pine tar, a legal substance used by hitters to improve their grip, on Brett's bat; the pine tar extended about 24 inches.
Was that length illegal?
Billy Martin cited to the umpires a rule that stated that any foreign substance on a bat could extend no further than 18 inches from the knob.
What happened to Brett after that?
an enraged Brett charged out of the dugout sprinting directly toward McClelland and had to be physically restrained by two umpires and a Royals coach.
Was he kicked out of the game for that?
The home plate umpire, Tim McClelland, signaled Brett out, ending the game as a Yankees win.

Question: What team was Brett playing for at the time?
Self-contained rewrite: What team was George Brett playing for at the time of the Pine Tar Incident?