Rivalries with other teams have escalated into serious violence. A group of ultras who label themselves the Fedayn — 'the devotees' — after a group of long-forgotten Iranian guerrilla fighters are regarded to be responsible for the organised hooliganism. In 2014 Daniele De Santis, a Roma ultra, was convicted of shooting Ciro Esposito and two others during clashes with Napoli fans who were in Rome for their club's
Coppa Italia final against Fiorentina. Esposito died of his wounds. De Santis was sentenced to 26 years in prison, later reduced to 16 years on appeal. Roma ultras have displayed banners celebrating De Santis.
There have been multiple instances of Roma
ultras attacking supporters of foreign clubs when playing in Rome. These attacks have regularly featured the Roma ultras using knives, poles, flares, bottles and stones on unarmed foreign supporters, resulting in multiple hospitalisations. Home games against Liverpool in 1984 and 2001, Middlesbrough in 2006,
Manchester United in 2007, Arsenal in 2009,Tottenham Hotspur in 2012, and Chelsea in 2017 have all resulted in multiple stabbings and other injuries to foreign supporters. In 2018, Roma ultras travelling to an away game at Liverpool attacked home supporters, resulting in a home supporter getting critically injured.
