For the most part, federal court jurisdictions only hear cases in which the United States is a party, cases involving violations of the Constitution or federal law, crimes on federal land, and bankruptcy cases. Federal courts also hear cases based on state law that involve parties from different states
A producer is someone who creates and supplies goods or services. Producers combine labor and capital—called factor inputs—to create—that is, to output—something else. Business firms are the main examples of producers and are usually what economists have in mind when talking about producers.
I would simply say "prank calls," but considering the "law enforcement" part, I'd say the answer is called swatting.