“(….) even where national security is at stake, the concepts of lawfulness and the rule of law in a democratic society require that deportation measures affecting fundamental human rights be subject to some form of adversarial proceedings before an independent authority or a court competent to effectively scrutinise the reasons for them and review the relevant evidence, if need be with appropriate procedural limitations on the use of classified information.
interpretation of the second subparagraph of Article 27(2), Article 28(1) and Article 28(3)(a) of Directive 2004/38/EC of the European Parliament and of the Council of 29 April 2004 on the right of citizens of the Union and their family members to move and reside freely within the territory of the Member States