US sport has never (at least in the modern era) had the hooligan problems that football (in particular) has in Europe. That is not to say there are never drunken fights or bad behavior at US sporting events. But organized thuggery in the form of firms or ultras is almost nonexistent.
Back in 2008 there was a scuffle between fans when West Ham played a friendly against Columbus Crew in Crew Stadium. The reports in the papers made it sound worse than it was, and the police response was unnecessarily heavy-handed (a helicopter become involved at one point, and at least one Columbus fan ended up being tazered by police in the parking lot after the match). It all stemmed from a single, shirtless, tattooed West Ham "fan" walking into the Nordecke and dumping a beer on several Crew supporters. A few more West Ham fans joined in the resulting discussion, fisticuffs ensued, at least one person (presumably the "fan" who started it) was arrested, and a few scattered fights broke out after the match in the parking lot.
It was one of the very few times I recall an altercation happening during a Crew match that was serious enough to warrant media attention. I never did find out if the West Ham "fans" involved were all Americans, or whether some were actually from the UK.
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I'd agree staying away is one way to go. However when all the seats are season tickets, it doesn't hurt the owners pocket all that much.
Not in the short term, but the ONLY thing owners care about is money (and, perhaps to a lesser extent, public image). If the fans could keep the stadium half empty for months, or even just a few weeks, it would affect the bottom line and create some very negative optics for the club suits. As it is, fan "marches" and match-day banners are easily ignored.
I've never understood why supporters' groups, which in some cases are reasonably well organized, have never attempted a fan "strike".
Newcastle supporters would be an ideal group for this. Once you really start costing that walking pile of excrement Mike Ashley some money, he might become less aloof.