The intimidation intensified in the run-up to Saturday's 2-2 draw between the two clubs at Pescara's Stadio Adriatico.
The outside walls of Grosso's family home in Spoltore, near Pescara, were covered with graffiti, while a rooster, which is the symbol of Bari, was found hanging lifeless at the gate.
Paper bombs were also exploded outside the team hotel the night before the match, in a bid to prevent Bari players sleeping.
Giovanni Loseto, a member of Grosso's coaching staff, was reported to have been threatened with baseball bats by a group of Pescara ultras.
"I don't want to talk about it because I have always lived there, I will always live here and the errors of a few won't change my view that Pescara is a very civilised city.
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