The CES was created after a three year long campaign, with the purpose of investigating the efficiency of the 1926 Slavery Convention.
The League of Nations had conducted an active work against chattel slavery and slave trade from the early 1920s.
[2] The CES Commission was composed of seven members: Albrecht Gohr (Belgium) as Chairman, Frederick Lugard, 1st Baron Lugard as Deputy Chairman, Tulio Zedda (Italy; later replaced by Ercole Vellani), Neytzell de Wylde (The Netherlands) Julio Lopez-Olivan (Spain), Gabriel Angoulvant (France) and Virginie de Castro e Almeida (Portugal).
However, it created a report which came to play an important part in the continued campaign of the NL against slavery and slave trade.
The result of the CES report convinced the League of the need to establish a permanent committee to address the issue.