1. European Union law (historically called "European Community Law") is a body of treaties and legislation, such as Regulations and Directives, which have a direct impact or indirect effect on the laws of the Member States of the European Union. The three sources of law of the European Union Primary, secondary law and supplementary law. The main sources of primary law are the Treaties establishing the European Union. Secondary sources include regulations and directives that are based on the Treaties. The European Union legislature is composed mainly of the European Parliament and the Council of the European Union, which under the Treaties may decide secondary law to pursue the objective set out in the Treaties. European Union law applied by the courts of the Member States and the laws of the Member States to provide for the rights of small European Union law can be applied by the courts of member states. In the case of European Union law which should have been transposed into Member States' laws, such as the Directive, the Commission may take proceedings against the Member State under the EC Treaty. The Court of Justice of the European Union's highest court is able to interpret EU law. Additional sources of European Union law, including case law of the Court of Justice of international law and general principles of European Union law.