Events Mobster Antonino Morddelo "Tony," "Joe Batters" Accardo becomes head enforcer for Al Capone's "Chicago Outfit". Danny Stanton, a former member of the Valley and Sheldon Gangs, assumes control as interim leader of arch rivals Saltis-McErlane organization. January 8 – Unione Siciliane leader Pasquale Lolordo is killed in his Chicago apartment, supposedly by mobster Joe Aiello and members of the North Side Gang. January 12 – Labor racketeer Cornelius Shea died in a hospital in Chicago after an operation for gallstones. February 14 – Four unidentified men, two of them dressed as Chicago police officers, storm into a Chicago garage and murder seven members of the North Side Gang, (among them optometrist Rheinhart Schwimmer and mechanic John May). Their primary target, gang leader George "Bugs" Moran, is not there. However, the St. Valentines Day Massacre effectively ends the five-year gang war between The Chicago Outfit and the North Side Gang. March 19 – William J. Vercoe, a colorful Chicago criminal noted for reciting poetry, is shot and killed by Westside O'Donnell gang member William Clifford while at the Pony Inn in Cicero, Illinois. April 14 – William Clifford is gunned down along with former Westside O'Donnall's gang gunman Michael Reiley. May 7 – Chicago Outfit hitmen Albert Anselmi and John Scalise, two of the men suspected in the murder of North Side Gang leader Dean O'Banion and fellow mob boss Joseph "Hop Toad" Giunta, the current Unione Siculiana President are all killed during a lavish party held at Al Capone's residence. The party was a ruse by mob boss Al Capone to lure the three men to their deaths after their plan to gain leadership of the Chicago Outfit by eliminating Capone is uncovered. The men where beaten to death by Capone, who used a baseball bat to commit the murders. May 9 – Prominent New York mob associate Meyer Lansky marries Anna Citron. May 13–15 – The Atlantic City Conference is held in Atlantic City, New Jersey by American East Coast and Midwest organized crime leaders. This conference would later result in the formation of the National Crime Syndicate of all Italian-American gangs. May 16 – Shortly after leaving the Atlantic City, New Jersey meeting, Chicago mob boss Al Capone is arrested by Philadelphia police and charged with carrying a concealed weapon. May 16 – Bootlegger Joe Porrazo "Disappears" after alleged confrontation with organized Crime Figures {Joseph Ardizzone} May