The Tunnel Club

From The Godfather Wiki

A nightclub owned by the Tattaglia Family, the Tunnel Club is operated by Carmine Tattaglia.

After the murder of Sonny Corleone by Tattaglia thugs, the perpetrators were tracked to this nightclub and revealed that the Tattaglia's had been funded by Don Barzini. Shortly after, the club changed hands, falling under the Corleone Family's influence.