Article 18 EC

1. Every citizen of the Union shall have the right to move and reside freely within the territory of the Member States, subject to the limitations and conditions laid down in this Treaty and by the measures adopted to give it effect.

2. If action by the Community should prove necessary to attain this objective and this Treaty has not provided the necessary powers, the Council may adopt provisions with a view to facilitating the exercise of the rights referred to in paragraph 1. The Council shall act in accordance with the procedure referred to in Article 251.

3. Paragraph 2 shall not apply to provisions on passports, identity cards, residence permits or any other such document or to provisions on social security or social protection.