There is not alot of info on Tom Di Bella (at least none that I'm aware of.)
He along with Yacovelli and Aloi are often left out of the Colombos general History.

Thats what makes it so interesting and fascinating, all these groups have rich history, that still haven't been 100% uncovered.For me the Colombos is a weak spot for me. I do know the main Characters Profaci, Colombo, Persico, Gallo but those acting bosses and intermediate powers aren't as analyzed. I guess that go with all the Families