Lord of the Flies (1963) on Netflix

After a plane crash in the ocean, a group of British students reach an island. The boy Ralph organizes the other kids, assigning responsibilities for each one. When the rebel Jack neglects the fire camp and they lose the chance to be seen by an airplane, the group split under the leadership of Jack. While Ralph rationalizes the survival procedures, Jack returns to the primitivism, using the fear for the unknown (in a metaphor to the religion) and hunger to control the other boys. His group starts hunting and chasing pigs, stealing the possession of Ralph's group and even killing people.