Judgment of the Court (Fourth Chamber) of 11 February 2021.#Katoen Natie Bulk Terminals NV and General Services Antwerp NV v Belgische Staat and Middlegate Europe NV v Ministerraad.#References for a preliminary ruling from Raad van State and Grondwettelijk Hof.#Reference for a preliminary ruling – Article 45 TFEU – Freedom of movement for workers – Article 49 TFEU – Freedom of establishment – Article 56 TFEU – Freedom to provide services – Carrying out of port activities – Dockers – Access to the profession and recruitment – Arrangements for the recognition of dockers – Dockers not part of the quota of workers provided for in national legislation – Limitation of the duration of the work contract – Mobility of dockers between different port areas – Workers carrying out logistical work – Safety certificate – Overriding reasons in the public interest – Safety in port areas – Protection of workers – Proportionality.#Joined Cases C-407/19 and C-471/19.