The origins of free movement of persons in the European Union are to be found in a conference held at King's College London, organized by the Immigration Law Practitioners' Association and the Centre of European Law at King's College, with the sponsorship of the European Commission. Published to mark the 30th anniversary of that conference, this book is divided into two sections, the first of which deals with the implementation of rights of nationals in the European Union to move, reside and pursue economic activities in other member-states. The second part looks at the development of European law regulating the movement, residence and economic activities of third-country nationals within the territory of the Union.;The two sections are analyzed both by reference to the black-letter law and the social consequences attendant upon migration within the European Union.