The organization is called the League of Nations
The League of Nations was an international body created by the Treaty of Versailles on June 28, 1919. It was proposed to establish the bases for peace and the reorganization of international relations once the First World War.
The League of Nations was based on the principles of international cooperation, arbitration of conflicts and collective security. The Covenant of the SDN (the first 26 articles of the Treaty of Versailles) was written in the first sessions of the Paris Conference, which began on January 18, 1919, at the initiative of the President of the United States, Woodrow Wilson.