On this day, Feb. 14, 1929, mobsters dressed as police officers entered gangster Bugs Moran’s headquarters in Chicago, lined seven of Moran’s henchmen against a wall, and gunned them down.

The prime suspect in what became known as the St. Valentine’s Day Massacre was Moran rival Al Capone. Moran’s North Side gang had hijacked Capone’s liquor shipment’s and murdered his allies. Capone was in Miami at the time of the St. Valentine’s Day killings and no one was ever tried for them.

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The cold-blooded carnage left the public outraged and attracted the spotlight of the federal government to Capone and his criminal activities. In 1931, Capone was convicted of income tax evasion and was imprisoned for 11 years.