in the begining of the novel
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Huck quits Tom's gang because he thinks that if they're not doing anything (robbing people) there's no point to being in a gang.
"We played robber now and then about a month, and then I resigned. All the boys did. We hadn't robbed nobody, hadn't killed any people, but only just pretended."
THE ADVENTURES OF HUCKLEBERRY FINN/ Chapter Three