Gennaro De Tommaso - known as “Genny the Swine” - was sentenced to two years and two months in prison for leading violence close to Rome’s Olympic stadium on May 3rd 2014.
He was also found guilty of climbing over fencing of the stadium’s Curva Nord to speak to police and Napoli players ahead of the clash with Fiorentina, Rai News said.
A Napoli supporter caught up in the clashes between rival fans was shot and later died in hospital. De Tommaso was not tried in connection to the death of Ciro Esposito, who was shot by an AS Roma supporter Daniele De Santis.
In De Tommaso’s trial, Prosecutor Giulia Proto cleared him of encouraging fans to throw objects onto the pitch and of wearing a t-shirt inciting violence.
The ultra leader had come under fire for the slogan on his t-shirt - "Speziale libero" (“Free Speziale”) - referring to ultra football fan Antonino Speziale, jailed for murdering police inspector Filippo Raciti.