In Chapter Eight of Lord of the Flies, Jack calls a meeting by blowing the conch and insists that the threat of the monster is real. Jack believes that Ralph is a coward who is incapable of handling the situation and calls for him to be removed from his position of leadership. The boys are unwilling to vote Ralph out of power, which causes Jack to storm off in a huff, assuring the group that those who wish to follow him are welcome to do so.
The result is a divided population, with some boys joining Jack on the beach to violently hunt down and kill a sow, whose head they offer up on a stake as a sacrifice to the beast. Jack's tribe then raids the old tribe's grounds and invites them to a feast and, once again, to join the new tribe. At this point, with the boys hungry and scared, Ralph has pretty much been stripped of all power.