No one can know who was the richest , as they are giving their best to cover everything. And to answer this: Corleonesi, the inner circle of Corleonesi at beginning.
And if you count beginning of Corleonesi as family, then most feared crew would be the one that run room of death in Sicily.
How many separate crews did the Corleonesi have? They had so many members. But I think the Corleonesi did end up becoming the richest crew after they inherited all of the rackets from their decimated enemies. Riina himself had $250 million in assets confiscated approximately. I am not sure how much of that was cash or other quickly convertible possessions of his.
