European Union law

European Union law
Name	European Union law
Caption	Flag associated with the European Union
Established	Treaty of Paris (1951); Treaty of Rome (1957); Maastricht Treaty (1992)
Jurisdiction	European Union

European Union law is the body of rules and principles that govern legal relations among the institutions of the European Union, its Member States such as Germany, France, Italy and Spain, and natural and legal persons within the Union. It emerged from post‑Second World War agreements including the Treaty of Paris (1951), the Treaty of Rome and later constitutional revisions culminating in the Maastricht Treaty and the Lisbon Treaty. EU law shapes policy in areas ranging from the European Single Market to external relations with actors like the United Nations and World Trade Organization.

History and development

The origins trace to the European Coal and Steel Community and the European Economic Community established by the Treaty of Paris (1951) and the Treaty of Rome, driven by figures such as Jean Monnet and decisions influenced by the aftermath of the Second World War and the reconstruction priorities of Marshall Plan. Enlargement rounds involving United Kingdom accession negotiations and the 1973 expansion, the 1986 Single European Act, and the 1992 Maastricht Treaty progressively deepened integration and introduced new fields like the European Monetary Union. The 2004 and 2007 enlargements brought post‑Cold War states such as Poland, Hungary and Romania into the legal order, while constitutional debates around the failed European Constitution and the successful Lisbon Treaty reshaped institutional competences and legal instruments.

Sources of EU law

Primary sources of the EU legal order are the founding treaties including the Treaty on European Union and the Treaty on the Functioning of the European Union, supplemented by protocols such as the Protocol on the Privileges and Immunities of the European Union. Secondary legislation includes regulation (EU), directive (EU), and decision (EU) adopted by the European Commission, European Parliament, and Council of the European Union under legislative procedures like the ordinary legislative procedure. Other instruments include recommendations, opinions, and international agreements concluded with third parties under the European External Action Service and agreements such as association agreements with Turkey and trade agreements with Canada and Japan. Soft law and general principles recognized by the Court of Justice of the European Union also function as legal sources.

Institutions and enforcement

Key institutions enforcing EU law include the European Commission as guardian of the treaties, the Council of the European Union, the European Parliament, the European Council and the Court of Justice of the European Union (CJEU), together with the European Central Bank for monetary competences. National authorities such as constitutional courts (for example, the Bundesverfassungsgericht of Germany and the Conseil constitutionnel of France) interact with EU institutions through preliminary reference procedures under Article 267 TFEU. Enforcement mechanisms encompass infringement procedures initiated by the European Commission and fines imposed by the Court of Justice of the European Union, as seen in high‑profile cases involving Apple Inc. and state aid decisions concerning Ireland and Luxembourg.

Principles and doctrines

Foundational doctrines include the principles of direct effect established in Van Gend en Loos v Netherlands, supremacy articulated in Costa v ENEL, proportionality developed through CJEU jurisprudence, and subsidiarity enshrined in the Maastricht Treaty. Fundamental rights protection evolved through the CJEU’s reference to the national constitutional traditions and instruments like the EU Charter of Fundamental Rights, and interaction with instruments such as the European Convention on Human Rights and judgments of the European Court of Human Rights. Doctrines addressing competence allocation, conferral, implied powers and the external competence of the Union guide the limits of action in policy fields like competition and trade.

Areas of substantive law

Substantive EU law covers the internal market including free movement of goods, persons, services and capital; competition law overseen by the European Commission and litigated before the General Court; trade law implemented through the Common Commercial Policy and World Trade Organization commitments; agriculture under the Common Agricultural Policy; environmental policy shaped by directives such as the Habitat Directive and regulations implementing the European Green Deal; and monetary policy performed by the European Central Bank within the Eurozone for Member States like Greece and Portugal.

Relationship with member state law

The relationship is governed by the doctrines of supremacy and direct effect, obliging Member States such as Poland and Spain to implement and disapply conflicting national rules. National constitutional courts, including the Constitutional Court of Italy and the Bundesverfassungsgericht, have at times asserted limits via constitutional identity reviews, prompting tensions resolved through CJEU references and political dialogue in the European Council and during EU summit negotiations. Mechanisms like enhanced cooperation and opt‑outs (for example, the UK opt‑outs prior to withdrawal) permit differentiated integration among Member States.

Judicial review and case law

Judicial review is centered on the Court of Justice of the European Union and its two major courts, the General Court and the Court of Justice. Landmark jurisprudence includes Van Gend en Loos v Netherlands, Costa v ENEL, Cassis de Dijon, and more recent decisions addressing state aid (Commission v Ireland (Apple)), data protection (Google Spain v AEPD), and the rule of law (Commission v Poland). Preliminary rulings under Article 267 TFEU enable national courts like the Supreme Court of the United Kingdom (prior to withdrawal) and the High Court of Justice to seek authoritative interpretations, creating a dense case law corpus that continuously shapes the boundaries of competencies and rights within the Union.

Category:European Union