53While national courts may, in principle, have occasion to consider whether a Community act is valid, they nonetheless have no jurisdiction themselves to declare acts of Community institutions invalid (Case 314/85 Foto-Frost [1987] ECR 4199, paragraph 20). The Court of Justice alone therefore has jurisdiction to determine that a Community act is invalid (Joined Cases C-143/88 and C-92/89 Zuckerfabrik Süderdithmarschen and Zuckerfabrik Soest [1991] ECR I-415, paragraph 17, and Case C-344/04 IATA and ELFAA [2006] ECR I-403, paragraph 27). That exclusive jurisdiction is also expressly set out in Article 41 of the ECSC Treaty.
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