Yes, it's the Sons of Ben, a "preemptive fan club" for Philadelphia's not-yet-in-existence MLS soccer club, profiled in the Guardian by Philadelphia Weekly's Steven Wells.
The SOBs have quite a reputation already for hooliganism, even though they as of yet have no team to root for or games to go to. But still, it's shocking to see how much Philly fans love their team when it has no players, coaches, or owners yet.
I'm not a huge soccer fan at all, though "How Soccer Explains the World" is one of the best books I've read in the past few years, and I've been meaning at some point to dive into the English Premiership (Tottenham Hotspurs is my team, I dig that "Yid Army" thing.) I'm sure I'll go to a few games if Philly gets the team, although I do think Chester, the poverty-ridden inner-ring suburb where they're building the stadium, has much, much better uses for a couple hundred million dollars than a soccer stadium.