Maybe if you measure success in terms of convictions it could be considered a powerful family - the same names have been running it for decades.

I certainly think it's possible, however unlikely, that they still exert substantial influence over certain crimes in the area. However, they are most definitely the smallest out of any remaining mafia families which means that they can't number more than a couple dozen at most. It's difficult for any criminal organization to remain as a power with those types of numbers.

I believe that they still have control over a small area of the city but have nowhere near the amount of influence they did in the seventies and eighties.

As an interesting aside, my old boss's first cousin was Harvey Leach, the furniture company president found murdered on his wedding day.