The International Labour Organization was established in 1919 as part of the Treaty of Versailles, making it the first specialized agency of the League of Nations. The ILO brought together government, employer, and worker representatives in a tripartite structure. Its initial mandate addressed working hours, unemployment, maternity protection, night work for women, and minimum working age. The organization later became the first specialized agency of the United Nations in 1946 and received the Nobel Peace Prize in 1969.