40By Article 173 and Article 184 (now Article 241 EC), on the one hand, and by Article 177, on the other, the Treaty has established a complete system of legal remedies and procedures designed to ensure judicial review of the legality of acts of the institutions, and has entrusted such review to the Community Courts (see, to that effect, Les Verts v Parliament, paragraph 23). Under that system, where natural or legal persons cannot, by reason of the conditions for admissibility laid down in the fourth paragraph of Article 173 of the Treaty, directly challenge Community measures of general application, they are able, depending on the case, either indirectly to plead the invalidity of such acts before the Community Courts under Article 184 of the Treaty or to do so before the national courts and ask them, since they have no jurisdiction themselves to declare those measures invalid (see Case 314/85 Foto-Frost [1987] ECR 4199, paragraph 20), to make a reference to the Court of Justice for a preliminary ruling on validity.
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