The Commonwealth years sought to end the privileges the Muslims had been enjoying under the earlier American administration. Muslim exemptions from some national laws, as expressed in the Administrative Code for Mindanao, and the Muslim right to use their traditional Islamic courts, as expressed in the Moro board, were ended. The Bureau of Non-Christian Tribes was replaced by the Office of the Commissioner for Mindanao and Sulu, whose main objective was to tap the full economic potentials of Mindanao not for the Muslims but for the Commonwealth. These "development" efforts resulted in discontent which found expression in the various armed uprisings, mostly in Lanao, from 1936 to 1941. The Muslims are generally adverse to anything that threatens Islam and their way of life. Che Man (1990:56) believes that they were neither anti-American nor anti-Filipino, but simply against any form of foreign encroachment into their traditional way of life. During World War II, the Muslims in general supported the fight against the Japanese, who were less tolerant and harsher to them than the American Commonwealth government.