Who worked for Scarface and is a suspect in the St. Valentine's Day Massacre? 
Gus Winkler: Gus Winkler (March 28, 1901 – October 9, 1933) was an American gangster who headed a Prohibition-era criminal gang specializing in armed robbery and murder for hire with Fred "Killer" Burke. Gus Winkler:  Winkler was an associate of Chicago mob boss Al Capone and is considered a suspect in the St. Valentine's Day Massacre. Al Capone: Alphonse Gabriel Capone ( ; ] ; January 17, 1899 – January 25, 1947), sometimes known by the nickname Scarface, was an American mobster, crime boss and businessman who attained fame during the Prohibition era as the co-founder and boss of the Chicago Outfit.
Gus Winkler