Judgment_paragraph 31 · Associazione per gli Studi Giuridici sull’Immigrazione (ASGI) and Others v Presidenza del Consiglio dei Ministri – Dipartimento per le politiche della famiglia and Ministero dell'Economia e delle Finanze (C-462/20)

31In that regard, it must be noted that, when the EU legislature has made an express reference to national law, as in Article 11(1)(d) of Directive 2003/109, it is not for the Court to give the terms concerned an autonomous and uniform definition under EU law. However, the absence of such an autonomous and uniform definition under EU law of the concepts of ‘social security’, ‘social assistance’ and ‘social protection’ for the purposes of that directive and the reference to national law do not mean that the Member States may undermine the effectiveness of that directive when applying the principle of equal treatment provided for in that provision (see, to that effect, judgment of 24 April 2012, Kamberaj, C‑571/10, EU:C:2012:233, paragraphs 77 and 78).