He is suspected to have player a major role in causing it yes.
Al Capone orchestrated the St. Valentine's Day Massacre
Al Capone was infamous for his Valentines day massacre.
The Saint Valentines Day Massacre
Because
Al Capone was the most likely suspect.
The Saint Valentines Day Massacre
the St. valentines day massacre happened on February 14, 1929
Al Capone was a famous gangster and mob boss who operated out of Chicago. He was famous for being behind the St. Valentines Day Massacre, and for having his own lavish cell at Alcatraz prison.
Al Capone made it be known that he was at his winter home in Florida, during the actual shooting. Although 1000 miles away, insiders knew he was responsible for the massacre that occured on Feb. 14, 1928.
It was on a Thursday.
The St. Valentines Day Massacre was the deadly result of a power struggle for control of Chicago's organized crime. The battle between Bugs Moran and Al Capone finally came to a head on February 14, 1929.
Al Capone managed (occasionally by the skin of his teeth) to avoid any of the massacres that reduced the gangster population on a regular basis back in the days of the big gangs (during Prohibition, for the most part). His name is connected to the St. Valentines Day massacre, but only around the edges. It was likely Capone's idea, but he did not plan it, nor execute it - in fact he conveniently was in Florida the day it took place.