Judgment of the Court (Grand Chamber) of 16 January 2024.#Österreichische Datenschutzbehörde v WK.#Reference for a preliminary ruling – Protection of natural persons with regard to the processing of personal data – Article 16 TFEU – Regulation (EU) 2016/679 – Article 2(2)(a) – Scope – Exclusions – Activities which fall outside the scope of Union law – Article 4(2) TEU – Activities concerning national security – Committee of inquiry set up by the parliament of a Member State – Article 23(1)(a) and (h), Articles 51 and 55 of Regulation (EU) 2016/679 – Competence of the supervisory authority responsible for data protection – Article 77 – Right to lodge a complaint with a supervisory authority – Direct effect.#Case C-33/22.