Jack said "Bollock to the rules" during the meeting in chapter 5: Beast From Water. Later, at the meeting in chapter 6: Beast From Air, Jack said, when talking about some of the other boys "...It's time some people knew they've got to keep quiet and leave deciding things to the rest of us---."
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Jack says that the conch is meaningless on his end of the island. He makes his own rules and does not consider Ralph a leader.
the other boys feel like they need to jack in the group. while they are building the signal fire the boys sneak off and go and join Jack's group.
Jack rules by imposing punishments on the boys. He controls them through brutal force. The conch is a symbol of civilization. On jack's side of the island, the conch holds no power. This is symbolic of how Jack and the other savages have lost all sense of civil behavior and have instead turned to savagery.
During the meeting when Jack talks of hunting the beast Ralph describes Jack's hunters as, "boys armed with sticks." Later, during the confrontation at Castle Rock, Ralph calls Jack a Thief.
Jack has the effect of allowing Roger the freedom to indulge in his fantasies. Ralph's rules and fairness where a refection of the civilised society that the boys came from and acted as a restraining influence on Roger. Jack's lack of rules and fondness for killing and violence allowed Roger to hurt and even kill people and pigs with no fear of disapproval. Roger felt free to do what ever he wanted.