Depends how "violent" they are - for instance, if they carry knives, then they're already breaking the law (at least here).
EDIT: Holy shit! In DLF's above post, I noticed the 'crime' part, but I didn't see the 'terrorist' part! Wow. Now whether it's a crime or not, as I said - depends on how violent they are...but fucking hell - to liken them with terrorists is another fucking matter! There is a matter of degree! There's a difference between 'thug' and 'terrorist'.
EvF
EDIT: Holy shit! In DLF's above post, I noticed the 'crime' part, but I didn't see the 'terrorist' part! Wow. Now whether it's a crime or not, as I said - depends on how violent they are...but fucking hell - to liken them with terrorists is another fucking matter! There is a matter of degree! There's a difference between 'thug' and 'terrorist'.
EvF