High Quality Content by WIKIPEDIA articles! Blaise Baheten Metock and Others v Minister for Justice, Equality and Law Reform (2008) C-127/08 (known as the "Metock case") was a groundbreaking European Court of Justice (ECJ) case of major political significance, especially in Ireland and Denmark. It dealt with the scope and applicability of Directive 2004/38 ("the Citizenship Directive") to Member States` family unification rules for their migrant citizens.Citizenship of the European Union was established by Article 20 of the Treaty on the functioning of the European Union (TFEU) and the Citizenship Directive 2004/38 elaborates the right of Union citizens and their family members to move and reside freely in the territory of a Member State, consolidating previous Directives dealing with the right to move and reside within the European Community (EC).