My vote goes to Louis (Lepke) Bucholter, who had a conglamorate in the Garment District, trucking, movies, bakeries, etc.
Well, what can you say. Lepke controlled a lot until he got fried. And, as you mentioned he had a lock on a lot of varied industries. After his demise Lepke's "assets" were parceled out among the Five Families. (I have no doubt thats one of the reasons why he was set up. In order to eliminate him and grab his rackets.)
