Perhaps you occasionally heard of them in 2008 and 2009: an Internet community that counted among its members teenagers still in high school, and which made the nightly news from time to time because of pranks aimed at public figures and organizations. By 2010, the "Internet vigilante" group known as "Anonymous" was making bigger waves. In December of that year, members of the community temporarily disabled Web sites maintained for Mastercard, Visa and PayPal over the companies' decision to stop processing transactions for Wikileaks.org. Then, they turned their attention to banks. "Top priority is to steal and leak classified government...