The writers of The Sopranos carefully researched the ways in which mobsters controlled and laundered their money in order to make Tony Soprano as realistic as possible, and they employed New York assistant district attorney Dan Castleman to advise on this issue. When Castleman was asked how much they had decided Tony would realistically be worth, he stated that it was roughly 5 or 6 million dollars - an amount that fluctuated, of course, because of Tony's substantial gambling problem.
