International sources of labor law, the ILO and its tripartite constituency, the system of supervision and control over the implementation of international standards, core conventions, guidelines for multinational enterprises and obligations of socially responsible conduct, transnational collective bargaining and international framework agreements, European Union social policy and the social provisions of the Treaties, charters of rights, free movement of workers and services, prohibitions of discrimination, European social dialogue, the relationship between economic freedoms and fundamental workers' rights, European Works Councils.