The Saint Valentine's Day Massacre is the name given to the 1929 murder of seven mob associates as part of a prohibition era conflict between two powerful criminal gangs in Chicago: the South Side Italian gang led by Al Capone and the North Side Irish gang led by Bugs Moran. Former members of the Egan's Rats gang were also suspected of having played a significant role in the incident, assisting Capone.

Massacre on St. Valentine's Day

Chicago's gang war reached its bloody climax in the so-called St. Valentine's Day Massacre of 1929. One of Capone's longtime enemies, the Irish gangster George "Bugs" Moran, ran his bootlegging operations out of a garage on the North Side of Chicago. On February 14, seven members of Moran's operation were gunned down while standing lined up, facing the wall of the garage. Some 70 rounds of ammunition were fired. When police officers from Chicago's 36th District arrived, they found one gang member, Frank Gusenberg, barely alive. In the few minutes before he died, they pressed him to reveal what had happened, but Gusenberg wouldn't talk.

Police could find only a few eyewitnesses, but eventually concluded that gunmen dressed as police officers had entered the garage and pretended to be arresting the men. Though Moran and others immediately blamed the massacre on Capone's gang, the famous gangster himself claimed to have been at his home in Florida at the time. No one was ever brought to trial for the murders.

http://theunexplainedmysteries.com/Valentine-Day-Massacre.html