Passionate fans help to make football the unique sport it is. The support of the faithful, unlike many sports, does not stop once the final whistle blows; it is something lived and professed throughout one's life, showing a commitment that at times borders on the obsessive.
Unfortunately, in many areas of the globe this fanaticism often can spill over into violence. The trend is exacerbated by the presence of organised fans, often dubbed "hooligans," whose interest in the sport seems to take a secondary standing to their love of fighting and causing mayhem.
The teams listed in this article have all suffered serious problems with violence in the last 10 years, to the point where fans have lost their lives as a result of the actions of others.