As cyberthreats mount, hacker’s conviction underscores criticism of government overreachWith that, the Justice Department began a case that has come to symbolize what some lawyers and civil libertarians see as overreach in the government’s campaign against cybercrime. The hacker, Andrew Auernheimer, was convicted and sentenced last month to more than three years in prison for obtaining about 120,000 e-mail addresses of iPad users from AT&T’s Web site – including New York Mayor Michael R.