Just on Lazio, look at some of the disgusting things their fans have been involved in over the last few years:
2001
Lazio received a 60million lire fine and a one-match ban from playing at home, as a result of their fans' behaviour at the game on 29 April 2001 against AS Roma, who are likely to win lo scudetto from their arch rivals on Sunday 17 June. Some fans held up a banner stating 'team of blacks, stand of Jews', targeting Roma's players and fans. Apparently, there were also racist chants against Roma's black players. Two weeks beforehand, Lazio were also given a fine of 35million lire for their fans' racist chants against Parma.
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No sooner had the final whistle been blown then they took to the streets looking for fights with the hard core element of the Roma support. In the end, various cars were torched, a number of policemen ended up in hospital whilst two journalists from the Italian national television station RAI were viciously attacked, simply because they were filming the proceedings.
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Right wing movements have found fertile ground among the impressionable young supporters, and the Ultras - the name given to the most fervent supporters' clubs - often double up as recruitment agencies for these organisations. Swastikas and other extremist symbols often decorate their banners. Fighting with opposition fans and creating havoc during away games is glorified. And racist slogans are the order of the day.
None more so than at Lazio, possibly the most xenophobic club in Italy. A year ago, a banner with the legend 'Onore Alla Tigre Arkan' (Honour to Tiger Arkan) resulted in widespread condemnation. 'Tiger' Arkan was a general in the Serbian army accused by the United Nations of genocide during the Balkan wars. He was also a hero to these Lazio fans. The banner was their way of honouring Arkan, who had been killed during the previous week.