The City Democratic Club was indeed located at 367 Clinton Street. It´s possible I guess that it was later moved to another location but Carlo´s books are riddled with factual errors, so perhaps we shouldn´t count on that it moved to the place he said.

There were several Democratic Clubs in Brooklyn I think but the one we are discussing here was formed in 1929 and functioned as meeting place for the top guys within the six ILA locals and some of Brooklyn´s most prominent Mafia guys (among them Vincent Mangano, John Giustra, Profaci, Anastasia, Joe Adonis and others). The Club was also a channel for controlling political life in several Brooklyn districts.