Free movement of persons and citizenship

Free movement of persons is the point at which EU law most visibly moves from market integration into constitutional membership. Week 5 treated free movement of goods as a discipline imposed on national regulation of products. This week concerns the movement of natural persons: workers, self-employed persons, service recipients, students, economically inactive citizens, family members, and third-country nationals whose position is derivative from an EU citizen. The central difficulty is that the law has never abandoned its market origins, but it has overlaid them with Union citizenship, equal treatment, residence rights, and a limited conception of transnational solidarity.

For Cambridge Part IB purposes, the topic is best approached in three layers. First, Article 45 TFEU confers directly effective rights on workers. That category is interpreted autonomously and generously: a worker is a person who performs services for and under the direction of another in return for remuneration, provided the activity is genuine and effective rather than purely marginal or ancillary. Once within Article 45, the claimant enjoys non-discrimination as regards employment, remuneration and other working conditions, plus ancillary rights necessary to make movement effective. Family rights and residence rights supplement the primary Treaty guarantee.

Secondly, Union citizenship under Articles 20 and 21 TFEU has widened the frame. Citizenship does not abolish conditions. Article 21 is expressly subject to limitations and conditions laid down in the Treaties and secondary legislation, principally Directive 2004/38. Yet citizenship changed the grammar of argument. Cases such as Martínez Sala, Grzelczyk, Baumbast, Bidar and Zambrano show the Court of Justice treating lawful residence, equal treatment and the genuine enjoyment of citizenship rights as constitutional principles rather than merely economic incidents.

Thirdly, the post-2008 case law, especially Dano and Alimanovic, reasserts limits. The Court became more willing to accept Member State insistence on compliance with Directive 2004/38 before economically inactive citizens can claim equal access to social assistance. The result is not simple retrenchment, but a more conditional citizenship. The examination task is to show both moments: the expansion from market citizenship to social membership, and the subsequent effort to police the boundary between mobility rights and welfare solidarity.

Brexit affects the domestic relevance but not the doctrinal importance of the topic. EU free movement law no longer governs new movement between the UK and the EU as it did before withdrawal. Nevertheless, it remains central to EU Law as an academic paper, to the interpretation of retained and assimilated EU law where relevant, and to the citizens' rights regime under the Withdrawal Agreement. In Tripos essays, do not reduce the topic to Brexit. Treat Brexit as a final contextual point unless the question expressly asks about domestic consequences.

The original EEC settlement conceived free movement of persons primarily as a market freedom. The worker was not a rights-bearing European citizen in the modern sense, but a factor of production whose mobility would improve allocation of labour and facilitate the common market. Article 48 EEC, now Article 45 TFEU, therefore prohibited nationality discrimination in employment and conferred rights to accept offers of employment, move, reside and remain. Early secondary legislation reinforced this economic structure, especially Regulation 1612/68, now substantially replaced by Regulation 492/2011.

The Court of Justice nevertheless interpreted the worker provisions purposively from the start. It resisted narrow national definitions of employment and gave the concept of worker an autonomous EU meaning. This was necessary because Member States could otherwise control the scope of Treaty rights by domestic classification. The Court also recognised that movement would be illusory if family members were excluded or if education, residence and social advantages were unavailable. Thus a formally economic freedom acquired social incidents: housing, education for children, tax advantages and integration benefits.

The Maastricht Treaty introduced citizenship of the Union. Its significance was initially uncertain. Article 20 TFEU, in its earlier numbering, made citizenship additional to national citizenship; it did not replace Member State nationality. Article 21 conferred a right to move and reside freely, but expressly subject to limitations and conditions. One possible reading was modest: citizenship merely collected existing free movement rights under a common label. The Court rejected that narrow view in stages. In Martínez Sala a lawfully resident Spanish national in Germany could rely on non-discrimination by reason of nationality in relation to a child-raising allowance. In Grzelczyk the Court announced that Union citizenship was destined to be the fundamental status of nationals of the Member States. In Baumbast it held that the Treaty residence right was directly effective notwithstanding the conditions in secondary legislation.

This development coincided with broader constitutionalisation of EU law. Direct effect, supremacy and state liability, covered in Weeks 2 to 4, supplied the techniques through which individuals could invoke EU rights in national courts. Free movement of persons became a central example of EU law's capacity to confer enforceable individual rights against national administrations. The same period also exposed a tension: if mobile citizens could claim equal treatment in social benefits, how far must national welfare systems be opened to non-national Union citizens?

Directive 2004/38 attempted codification and compromise. It consolidated rights of Union citizens and their family members. It created a graduated structure: up to three months with minimal conditions; residence beyond three months for workers, self-employed persons, persons with sufficient resources and students; permanent residence after five years of lawful residence; and protection against expulsion increasing with integration. This structure reflects the central bargain of EU citizenship: movement and residence are rights, but equal access to welfare may depend on lawful residence and a sufficient connection with the host society.

The financial crisis and enlargement anxieties sharpened Member State resistance. The Court's later case law, particularly Dano, Alimanovic and García-Nieto, is less romantic than Grzelczyk. It accepts that economically inactive citizens who do not satisfy the Directive's conditions may be denied certain social assistance benefits without an individual proportionality enquiry in every case. The evolution is therefore dialectical. EU citizenship expanded beyond economic status, but it did not produce unconditional social membership. It remains a status mediated by nationality, residence, integration and the limits of solidarity.

The first principle is the autonomous meaning of worker. A Member State cannot define worker restrictively so as to avoid Article 45 TFEU. The classic formula is that the person must, for a certain period, perform services for and under the direction of another in return for remuneration. The work must be genuine and effective, not merely marginal and ancillary. Part-time work, low pay and supplementing income by public funds do not necessarily prevent worker status. The enquiry is qualitative, not simply arithmetical. In an examination, begin by identifying whether the claimant is a worker before moving to citizenship. Worker status remains the strongest route.

The second principle is equal treatment. Article 45 prohibits direct nationality discrimination in employment, remuneration and other conditions of work. Regulation 492/2011 extends equal treatment to social and tax advantages connected with worker status. Direct discrimination can be justified only within the Treaty derogations, principally public policy, public security and public health, and these are strictly construed. Indirect discrimination and indistinctly applicable obstacles may be justified by objective considerations, provided they are proportionate. For workers, the Court has often treated residence requirements, language rules and qualification barriers as suspect where they impede access to employment.

The third principle is market access. Although Article 45 is phrased as non-discrimination, the Court has also condemned national measures which hinder or make less attractive the exercise of free movement rights. Bosman is the paradigm: transfer rules and nationality quotas in football impeded the movement of professional players. This mirrors the move in goods from a discrimination model to an access model, but the personal context matters. A rule affecting employment may restrict autonomy, family life and social integration as well as market participation.

The landmark cases should be organised by doctrinal function rather than memorised chronologically. The first cluster concerns worker status and market access. Van Duyn established that free movement provisions could be invoked by individuals and that public policy derogations were available but narrowly supervised. Bosman transformed Article 45 by treating football transfer rules and nationality quotas as restrictions on access to the labour market. Its importance lies not merely in sport but in the recognition that rules made by non-state bodies may fall within free movement where they collectively regulate gainful employment.

The second cluster concerns the emergence of citizenship as a source of equal treatment. Martínez Sala is the turning point: a Union citizen lawfully resident in another Member State could invoke Treaty non-discrimination in relation to a social benefit. Grzelczyk then supplied the constitutional slogan that citizenship is destined to be the fundamental status of Member State nationals. Bidar extended equal treatment to student maintenance assistance where the host state could require a genuine link, although not by disproportionate or automatic exclusion.

The third cluster concerns residence and the conditions attached to citizenship. Baumbast held that Article 21 had direct effect, but the claimant's circumstances also showed the importance of proportionality. A citizen with sufficient resources and medical cover should not lose residence rights by an unduly rigid application of technical insurance conditions. Brey later suggested an individual assessment before treating a citizen as an unreasonable burden, but that language must now be read with Dano and Alimanovic.

The fourth cluster concerns family rights and the substance of citizenship. Zhu and Chen recognised that a young Union citizen with sufficient resources could reside in the host state and be accompanied by a third-country national parent, since otherwise the child's right would be ineffective. Zambrano created a more exceptional doctrine: a Member State may not take measures which deprive Union citizens of the genuine enjoyment of the substance of their citizenship rights. Its practical scope has been narrowed. It is not a general family reunification principle. It applies where the Union citizen would, in reality, be compelled to leave the territory of the Union.

The fifth cluster concerns retrenchment and welfare boundaries. Dano held that an economically inactive citizen who did not satisfy the conditions of Directive 2004/38 could not rely on equal treatment to claim certain subsistence benefits. Alimanovic confirmed that Member States may rely on the Directive's structured limits in relation to jobseekers and retained worker status. These cases do not overrule Grzelczyk; they insist that the fundamental status language operates within a legislative scheme.

The final point for supervision discussion is methodological. The Court often reasons through effectiveness: would the citizen's Treaty right be rendered illusory? But it also reasons through institutional balance: has the EU legislature already fixed the conditions for residence and equal treatment? Good answers identify which mode of reasoning is dominant in the case before them.

See practice questions section below.

See further reading section below.