By-Prod Corporation, Plaintiff-Counter-Defendant-Appellee v. Armen-Berry Company, Defendant-Counter-Plaintiff-Appellant

POSNER, Circuit Judge.

This case raises questions of federal counterclaim practice, pendent jurisdiction, and civil liability (federal and state) for “bugging” telephone conversations. It is an offshoot of a federal antitrust suit brought by By-Prod Corporation against the ArmenBerry Company. Both firms are processors of animal glands for sale to pharmaceutical manufacturers. The antitrust suit (which has not yet gone to trial) alleges that Ar-men-Berry and others conspired to divide the market for buying animal glands from slaughterhouses, to depress the prices they pay for the glands, and to…