International labour law (also called "labour standards") is the body of rules spanning public and private international law which concern the rights and duties of employees, employers, trade unions and governments in regulating the workplace. The International Labour Organization and the World Trade Organization have been the main international bodies involved in reform labour markets. The International Monetary Fund and the World Bank have indirectly driven changes in labour policy by demanding structural adjustment conditions for receiving loans or grants. Conflict of laws issues arise, determined by national courts, when people work in more than one country, and supra-national bodies, particularly in the law of the European Union, has a growing body of rules regarding labour rights.