What's going on with fan disorder at European games?
https://www.bbc.co.uk/sport/football/articles/c75vz7lgr76o
That article doesn't really say alot apart from English fans ranking highly for behaviour, with only nations with small fan numbers (likes of Faroe Islands, Luxemborg) ranked higher.
Also, more pertinent -
‘Young Boys have regularly been in trouble with Uefa, and only last week the threat of a ban on travelling fans was lifted after a two-year probation expired’ after an incident in Manchester and..
‘In February this year, Young Boys had a suspended partial home stadium closure activated for the lighting of fireworks, with a new and more substantial ground punishment placing them on probation for another two years’