| European Court of Justice|
| (1978) Case 106/77,  ECR 629|
Costa v ENEL, R (Factortame Ltd) v Sec, Van Gend en Loos v Nederlan, Defrenne v Sabena (No 2), Marleasing SA v La Comercia
Amministrazione delle Finanze v Simmenthal SpA (1978) Case 106/77 is an EU law case, concerning the conflict of law between a national legal system and European Union law.
Amministrazione delle Finanze dello Stato v Simmenthal SpA Wikipedia
Simmenthal SpA imported beef from France into Italy. Italy imposed a public health inspection fee for the meat crossing the frontier under an Italian Law of 1970. This conflicted with European Community Regulations from 1964 and 1968.
Italian courts heard argument that Italian law must prevail because it was passed after the Regulations, and must be applied by the Italian courts until the law was declared unconstitutional. It referred the question of what to do in a case of conflict to the ECJ. The Attorney General Reischl gave an Opinion suggesting that timing of the Italian law was irrelevant, and EU law was supreme.
The ECJ held that the national court had a duty to give full effect to Community provisions, even if a conflicting national was adopted later.