The Leagues Commission's were composed of lawyers, trade unionists and financial experts from across the member nations. These individuals formed and cooperated to solve problems that were left behind from the war. This is a fine example of internationalism that led to several achievements in the 1920s:

Refugee Committee - helped return 400,000 people home after the war, who were either displaced or made prisoners of war
International Labour Organisation - campaigned for workers' rights, especially for women and children
Declaration of the Rights of the Child - still in force today
Health Committee - funded research for cures of fatal diseases, such as the development of vaccines for malaria and leprosy. Also, fought against drug trafficking and slavery (e.g. 200,000 slaved freed in Sierra-Leone, which was owned by Britain)
Financial Committee - came up with economic plans to solve the financial collapses that occurred in Austria and Hungry in 1922-23

The League developed over time as a place for experts to exchange ideas and improve lives. Eventually, the League was replaced by the United Nations in 1945.