The Member States 25 March 1957, Consolidated version of the Treaty establishing the European Atomic Energy Community#TITLE III - Institutional and financial provisions#CHAPTER 3 - PROVISIONS COMMON TO SEVERAL INSTITUTIONS#Article 161

If the State concerned does not comply with such a request within the period laid down by the Commission, the latter may bring an action before the Court of Justice of the European Union to have the infringement of which the person or undertaking is accused established.