After the war, Luxembourg ended its neutrality, and became a founding member of several inter-governmental and supra-governmental institutions. In 1952, the city became the headquarters of the High Authority of the European Coal and Steel Community. In 1967, the High Authority was merged with the commissions of the other European institutions; although Luxembourg City was no longer the seat of the ECSC, it hosted some part-sessions of the European Parliament until 1981. Luxembourg remains the seat of the European Parliament's secretariat, as well as the Court of Justice of the European Union, the European Court of Auditors, and the European Investment Bank. Several departments of the European Commission are also based in Luxembourg.  The Council of the EU meets in the city for the months of April, June and October annually.