Nicky is a thug.
After the death of Peter Parker's Uncle Ben, Peter took to the streets looking for vengeance against the Cash Register Thief. Nicky was roughing up his girlfriend giving her a warning. Peter interjected and accused him of being Ben's killer, beating him up. Peter fled as a gang of men rushed into the alley.
Nicky chased Peter to the rooftops where Peter dangled him from the edge of a building. Realising he wasn't Uncle Ben's killer because he didn't have a star tattoo on his wrist, Peter pulled Nicky up so he could grip the ledge and then left, falling through the roof into a wrestling ring.