For what purpose does Jack want his choir used in "Lord of the Flies"?

Jack wants "his" choir to be hunters. In order to placate Jack for having lost the chief's election, Ralph agrees to Jack's request. Ralph does not understand Jack's thirst for power and by putting Jack in charge of the hunters, Ralph is making a huge tactile mistake. Jack will be able to use "his" hunters and his position to help undermine Ralph's authority.