St Valentine's Day Massacre
From Tardis Wiki, the free Doctor Who reference
The St Valentine's Day Massacre was a mass shooting in Chicago on 14 February 1929.
After several attempts were made to kill Al Capone by rivals, Agonal convinced the gangster to retaliate. He had some of his men impersonate police officers and raid the Gusenberg gang. They lined them against the wall and machine gunned them all. (PROSE: Blood Harvest)
