The article discusses various core EU legislation related to primary constitutional laws, competition law, free movement of goods, persons, and services, social security, employment equality, worker protection, and consumer protection. Key laws mentioned include the Treaty Establishing the European Community, Treaty on European Union, and various Council Directives and Regulations. These laws aim to regulate different aspects of the European Union, such as promoting competition, ensuring free movement of goods and people, protecting workers' rights, and safeguarding consumer interests.