The Belgians intended the colony to be profitable. They introduced coffee as a commodity crop and used a system of forced labor to have it cultivated. Each peasant was required to devote a certain percentage of their fields to coffee and this was enforced by the Belgians and their local, mainly Tutsi, allies. A system of "corvée" that had existed under "Mwami" Rwabugiri was used. This forced labour approach to colonization was condemned by many internationally, and was extremely unpopular in Rwanda. Hundreds of thousands of Rwandans immigrated to the British protectorate of Uganda, which was much wealthier and did not have the same policies.