From what i've read about them (which is very little) they were always a small family but quite powerful in their on right, i know they had influence in some Laborers unions as well as the usual rackets Loan sharking,gambling etc, and if i'm not mistaken they had some small involvment in Las Vegas. My guess is they've been gone since the 90's.
Yeah, the last case involving the St. Louis mob was when Trupiano was busted for running a card game on union time back in the early 1990's.
