After Mitch Williams gave up the home run to Joe Carter in Game 7 of the World Series, a radio DJ gave out William's address and by the next night his house was pelted with eggs, garbage thrown on his lawn, and graffiti drawn on his property. He was forced to move to another city.
More recently, The Bartman was run out of Chicago for trying to catch a foul ball.
In Brazil, a socker player was killed by the local drug cartel for making a blunder that cost Brazil the game.
As for Barry Bonds, he had syringes thrown out on the field near him. I don't think anyone was trying to hurt him.