Re: Selina K/Eddie N
Start small. You could find a man in your ranks who's a big, fat, juicy steak for a bat. Someone abusing girls or selling drugs to kids. You could tip them off to a gun shipment that needs to quietly disappear. I could start giving secrets about the other mobs until you're truly the only one in town that's worth a damn. It'll look like you're dismantling.
You don't even have to do it right away. Arkham is the biggest problem in Gotham as it stands.