BR - Football is known as the sport around the world with the most violent fans around. Whether be organized hooliganism to random acts of thuggery and violence in many cases it has been proven as the truth.
Webster's Dictionary defines with word thug as; a brutal ruffian or assassin. While the second part of the definition is taking it to the extreme in our current discussion, brutal ruffian definitely is much more in the ballpark.
shit gets crazy...