Snap was one of two henchmen for Dr. Hugo Strange, the other one was named Numbers.
History
Snap and Numbers helped Strange's guests get properly situated for his auction of Batman's secret identity. The guests were three of Batman's worst enemies — the Joker, Two-Face and the Penguin — and he and Numbers helped them get their bags of money into the auditorium. After Batman replaced the incriminating video with a false video of Strange hustling the three rogues, Snap and Numbers tried to gun down the rebellious criminals. The Penguin and Two-Face stole their guns and it's unknown if they survived the attack.