Introduction

National courts are the principal judicial enforcers of European law. “Ever since Van Gend en Loos the Court has maintained that it is the task of the national courts to protect the rights of individuals under [Union] law and to give full effect to [Union] law provisions.” Indeed, whenever European law is directly effective, national courts must apply it; and wherever a Union norm comes into conflict with national law, each national court must disapply the latter. The Union legal order thereby insists that nothing within the national judicial system must prevent national courts from exercising their functions as “guardians” of the European judicial order. In Simmenthal, the Court thus held that each national court must be able to disapply national law – even where the national judicial system traditionally reserves that power to a central constitutional court:

Functionally, the direct effect (and supremacy) of European law thus transforms every single national court into a “European” court. This decentralized system differs from the judicial system in the United States in which the application of federal law is principally left to “federal” courts. Federal courts here apply federal law, while State courts apply State law.