Case C-718/19: Judgment of the Court (Grand Chamber) of 22 June 2021 (request for a preliminary ruling from the Cour constitutionnelle — Belgium) — Ordre des barreaux francophones et germanophone, Association pour le droit des Étrangers ASBL, Coordination et Initiatives pour et avec les Réfugiés et Étrangers ASBL, Ligue des Droits de l’Homme ASBL, Vluchtelingenwerk Vlaanderen ASBL v Conseil des ministres (Reference for a preliminary ruling — Citizenship of the Union — Articles 20 and 21 TFEU — Directive 2004/38/EC — Right of citizens of the Union and their family members to move and reside freely within the territory of the Member States — Decision to terminate a person’s residence on grounds of public policy — Preventive measures to avoid any risk of the person concerned absconding during the period allowed for that person to leave the territory of the host Member State — National provisions similar to those applicable to third-country nationals under Article 7(3) of Directive 2008/115/EC — Maximum period of detention for the purpose of removal — National provision identical to that applicable to third-country nationals)