Solomon Dwek is the kind of guy who can get you a kidney. He's also the kind of guy who authorities say knew how to get dirty money cleaned and could easily navigate the backrooms of New Jersey politics. He is, after all, a self-described member of the "green party," where "green is cash." The FBI put Dwek's knowledge to use, and that has placed him at the center of a corruption case that is unprecedented by even New Jersey's notorious standards. Relying largely on Dwek's work as an informant, authorities in July arrested 44 people — seven of whom...