The president of the Italian Football Federation (FIGC) has threatened to halt all league football in the country after a weekend of violence.
Pancalli has appealed for calm after last weekend's violence
On Saturday an official of amateur club Sammartinese died when he was caught up in a fight between players and fans.
Clashes between supporters and police continued in several cities on Sunday.
FIGC president Luca Pancalli said: "We are on high alert. To defend referees and the image of football, I am ready to take drastic measures."
The first outbreak of violence took place in the southern town of Luzzi.
Ermanno Licursi, 40, collapsed and died after being punched while trying to separate brawling players and fans at the end of Sammartinese's amateur game against Cancellese.
There were more clashes on Sunday which affected clubs in Serie A and B.
In Florence, a Livorno supporter needed 20 stitches in his head after being attacked by Fiorentina fans.
Police also had to battle a hundred Atalanta fans who tried to attack coaches carrying Catania fans.
And a Serie D game between Genzano and Normanna was suspended early in the second half after a linesman was hit by a drum thrown from the stands.
"I hope that with the contribution of everyone - officials, coaches and players on the pitch and also the true fans and football lovers in the stadiums - we can restore a climate of sportsmanship and respect that will avoid stopping the leagues," Pancalli added.