Recently there are these massively online games (like ultima online, star wars galaxies, ever quest, world of warcraft, etc) where you're in a Tolkienesque fantasyworld with thousands of others. People form guilds here, they are like gangs of sorts that help each other, and in many cases have some sort of heirarchy. In many cases, this heirarchy is for fun and games, but I feel in some cases
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"Cults," Sects, and "New Religious Movements"