Detroit Pistons head coach Chuck Daly yells instructions from the sidelines during a game against the Milwaukee Bucks in Milwaukee, May 15, 1989. (AP Photo/Duane Burleson)
FBI investigated letters sent to Daly
The FBI investigated a series of threatening letters sent to Detroit Pistons coach Chuck Daly at the height of his team's success during the 1989-90 "Bad Boys" championship era, newly released government records show.
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