One of my players chose the Ex-Sczarni campaign trait for the Shattered Star AP. She wants to pick the gang she came from so she can play off it, but needs to know more about the various Sczarni gangs first. Does anyone know where I can find some info on them? I'm having trouble finding anything.
It's all in Paizo's own Golarion material. However, individual gangs are up to the GM. They have a generally East-European or Sicilian feel to them, so make up something Mafiosi or Gypsy. Yes, it can be a bit culturally stereotypical if you let it, so mind out.
There are a few mentioned in the Magnimar supplement. I just made up a bunch of colourful and idiosyncratic groups that were more or less under the main branch. A few were so despicable they were all but disowned, most were more part of the machine.