Judgment of the Court (Grand Chamber) of 21 December 2023.#Criminal proceedings against G.K. and Others.#Request for a preliminary ruling from the Oberlandesgericht Wien.#Reference for a preliminary ruling – Judicial cooperation in criminal matters – European Public Prosecutor’s Office – Regulation (EU) 2017/1939 – Article 31 – Cross-border investigations – Judicial authorisation – Scope of the review – Article 32 – Enforcement of assigned measures.#Case C-281/22.