Funny enough, almost all forms of the mafia in fact do social works projects. Their scale has historically not been large enough to build bridges though, however they almost all fund social programs to one degree or another.

The Italian Mafia both in NY and Italy have done that. Escobar did it. Al Capone did it. Etc. One can certainly debate their reasoning for doing it of course (eg buying goodwill so they can continue their crime spree, set up an underdog appeal and so on).