What accent does Dandy Dan from Bugsy Malone speak in?

Dandy Dan, played by John Cassisi, in the 1976 musical film "Bugsy Malone" speaks with an American New York accent.

His character is a gangster with a flamboyant personality, and his accent reflects this. It's a characteristic of the film's overall style, which blends gangster movie tropes with a playful, almost cartoonish aesthetic.