The Sultan of Brunei participated in efforts to form a federation of Malaysia with the Federation of Malaya, Crown Colony of Sarawak, Crown Colony of North Borneo and the Colony of Singapore, but decided not to in the end due to the issue of oil profits and massive popular opinion against the move. This wish by the sultan resulted in a coup by the most populous party in the nation, comprising a vast majority of the population, by the Brunei People's Party (PRB). This failed due to poor organisation and their leader, A.M. Azahari, not even being in the country during the coup. Another option considered was a federation between North Borneo, Sarawak, and Brunei, but this was rejected due to oil revenues and the possible limitation of the Sultan's power.