 An associate of labor racketeer Timothy "Big Tim" Murphy, Cosmano was tried with Murphy, Michael "Dago Mike" Carozzo and James Vinci, in the 1920 gangland slaying of Maurice "Mossy" Enright.However, Cosmano, Murphy, and Carozza were eventually released due to lack of evidence.Cosmano, Murphy, and others attempted to steal $380,000 in cash and bonds from the US Mail in 1921.