The Saint Valentine's Day Massacre was the 1929 Valentine's Day murder of seven members and associates of Chicago's North Side Gang. The men were gathered at a Lincoln Park garage on the morning of Valentine's Day. They were lined up against a wall and shot by four unknown assailants who were dressed like police officers. The incident resulted from the struggle to control organized crime in the city during Prohibition between the Irish North Siders and their Italian South Side rivals led by Al Capone. The perpetrators have never been conclusively identified, but former members of the Egan's Rats gang working for Capone are suspected of a significant role, as are members of the Chicago Police Department who allegedly wanted revenge for the killing of a police officer's son.