Taylor v. United States, No. 14-6166, deals with one of the broadest laws for extending federal criminal jurisdiction to seemingly local cases, the Hobbs Act. Any robbery affecting interstate commerce is within federal jurisdiction, and given the post-1937 definition of interstate commerce, that is a very broad sweep. In today's case, any robbery of drug dealers can be a federal offense.
RJR Nabisco v. European Community, No. 15-138, involves civil suits under the Racketeer Influenced and Corrupt Organizations Act. The Court puts some limits on this much-misused procedure, blocking civil RICO suits where the acts are all outside the United States.