Jack Sirocco (1882–1954) was a New York City gangster involved in labor racketeering and strikebreaking.
Sirocco remained with the gang as manager of the Pearl House dance hall with Johnny Torrio and the satellite James Street Gang, until 1911 when he and Chick Tricker left wounded Eastman leader Jack Zelig behind during a failed robbery.
Zelig, however, was informed of the attempt by Ike the Plug and killed Morrello during a party at the Stuyvesant Casino Hall on December 2, 1911.
In November 1913 the two gangs clashed as Sirocco's gang, hired by the Feldman Hat Company as strikebreakers against union workers protected by Benny Fein's gang, quickly escalated into a major gunfight in which Fein lieutenant Max Greenwalt was killed (most likely by Sirocco member Red Murray although other sources state that Greenwalt was killed by Johnnie Dike in a gunfight on Broome Street).
Benny Fein planned an ambush to eliminate the Sirocco gang as they were attending a local dance at Arlington Hall on January 9, 1914.