We spoke to Derek "Diablo" Alvarez, who founded the Miami Casuals and plans to turn hooliganism into a joint US-UK combat sport.
Whether on social media, fan forums or niche online clothing outlets, the look and lifestyle of the football casual still appeals to many people. So why is this decades-old phenomenon still relevant?
For a decade, Nick Hay lived the life of a football casual, travelling the Netherlands to watch his team – and getting involved in a fair few scraps along the way. Today, he credits the experience with making him a better person.
With all the street fights and police face-offs, the Baby Squad of Leicester crossed racial divides and created an unexpected utopia in a changing city.
We went to Warsaw to see how Poland's new right-wing government affected the traditionally hostile nationalist march.
"Rich conservatives who own a lot of things are also the quickest to crack down on anything that has a hint of danger or violence involved in it."
At a Sunday gathering of the Hooligans Against Salafists, fans overturned a riot van and 44 police officers were injured in the ensuing violence.