just a little bit i found about the Roma Ultras:
great supporters of the team. Threatening their club's captain and making up a bullshit rumour just to show off how violent and powerful they are.
Then in 1977 all of these factions came together under the name Commando Ultrà Curva Sud (also known as CUCS). This group of ultras became one the most organised in Europe in the 1980's creating amazing visual displays inside stadiums. However in 1987 the group began to break up and new groups began to form. Roma now has many different ultras groups.
Roma have had there fair share of tear ups over the years. In 1979 during the Rome derby, Lazio fan Vincenzo Paparelli was killed after being hit with an emergency flare that was fired directly from the Curva Sud.
During the 2004 derby rumours spread among Roma fans that a child had been killed by police outside the stadium forcing the abandonment of the match after just 4 minutes. Riots broke out in the stands and numerous fireworks and flares were being set off. Three of Roma's top boys then stormed onto the pitch to talk to Francesco Totti and demanded that the game be abandoned. Totti asked for the game to be called off and later claimed on TV he had been threatened with his life. The match was abandoned but stands were set on fire as police used tear gas to beat back the onslaught.
More than 170 people were injured including police officers as riots broke out in the surrounding streets around the stadium. Cars were set on fire, shops had there windows smashed as fighting raged around the outside of the stadium. Why did the rumours surface? So the ultras could show how powerful they were.