The most famous hacktivist collective is Anonymous, which lacks clear leadership, a cohesive organizational structure and a definitive ideology. Here, members of Anonymous in Los Angeles sport Guy Fawkes masks. (Photo: Vincent Diamante)

The most famous hacktivist collective is Anonymous, which lacks clear leadership, a cohesive organizational structure and a definitive ideology. Here, members of Anonymous in Los Angeles sport Guy Fawkes masks. (Photo: Vincent Diamante)

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