Not all the brothers got in because of Jerry either, one of them I think Donato maybe? killed his way in. Jerry even mentioned it on wiretaps when fussing with his brother that he was the only killer in the room.

Angiulo had all of Boston in his pocket when it came to gambling so just imagine being over a city like Boston and raking in everything. Like pmac said, he owned a shitload. Fucker even owned a hospital!