ZZ v. Secretary of State for the Home Department

This reference for a preliminary ruling especially concerns Directive 2004/38/EC on the right of citizens of the Union and their family members to move and reside freely within the territory of the Member States. It concerns more precisely the decision to exclude a Union citizen from a Member State on grounds of public security and the extent of the obligation to inform the citizen concerned of the grounds for that decision.

The Court ruled that: 

The essence of the reasons for a decision refusing entry into a Member State must be disclosed to the person concerned. However, a Member State may, so far as is strictly necessary, refuse to notify the person concerned of ground, the disclosure of which might compromise State security.