A concept of enterprise liability was developed in fields such tax law, accounting practices, and antitrust law that were gradually received into the courts' jurisprudence.
He was involved in landmark cases in election and redistricting law, trade regulation, securities, trusts and antitrust law, drug regulation, corporate law, sports law, and successions.
When enterprises are not under public ownership, and where regulation does not foreclose the application of antitrust law, two requirements must be shown for the offense of monopolization.