Joined Cases C-407/19 and C-471/19: Judgment of the Court (Fourth Chamber) of 11 February 2021 (requests for a preliminary ruling from the Raad van State, Grondwettelijk Hof — Belgium) — Katoen Natie Bulk Terminals NV, General Services Antwerp NV (C-407/19), Middlegate Europe NV (C-471/19) v Belgische Staat (C-407/19), Ministerraad (C-471/19) (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)