The European Communities Act 1972 (c 68), also known as the ECA 1972, was an Act of the Parliament of the United Kingdom which made legal provision for the accession of the United Kingdom to the three European Communities the European Economic Community (EEC, the 'Common Market'), European Atomic Energy Community (Euratom), and the European Coal and Steel Community (ECSC); the EEC and ECSC subsequently became the European Union. The Act also incorporated into the domestic law of the United Kingdom Community Law and its , its treaties, regulations and directives, together with judgments of the European Court of Justice, and the Community Customs Union, the Common Agricultural Policy (CAP) and the Common Fisheries Policy (FCP).