"It's been speculated that Joey "Batters" Accardo, who also worked as Capone's bodyguard, had a hand in planning the bloody 1929 St. Valentine's Day Massacre that left seven members of the Bugs Moran gang dead. In his book, Accardo: The Genuine Godfather, Former FBI agent William F. Roemer Jr. said it was possible that Accardo was a machine gunner. The case, of course, was never solved." http://www.sbnation.com/nfl/2016/4/18/11454086/joey-bosa-great-grandfather-mob-boss-chicago-al-capone