A. Aaron Weisburd slogged up to his attic at 5 a.m. to begin another day combing through tips he had received about possible pro-terrorist activity on the Internet.
It did not take long for one e-mail to catch his attention: Ekhlaas.com was offering instructions on how to steal people’s personal information off their computers. It was a new development for an Islamic discussion site accustomed to announcing “martyrdom operations,” or suicide bombings, against U.S. troops and others in Iraq.
Weisburd quickly listed the discovery in his daily log of offensive and dangerous sites, alerting his supporters. A few days later, Ekhlaas experienced an unusual surge in activity, the hallmark of a hacker attack, forcing the company hosting the site to take it down.
It was another small victory for Weisburd, one of a new breed of Internet activists. Part vigilantes, part informants, part nosy neighbors, they search the Web for sites that they say deal in theft, fraud and violence.
[...] Government agencies and others are not sure what to make of him. Some law enforcement officials praise his efforts. Kenneth Nix, a police detective from Missouri who is on the Internet Crimes Task Force, said Weisburd often provides information that “we didn’t have before.”
But others say that he is making more trouble than he is doing good. Some U.S. officials think that they can learn more about terrorist operations by monitoring suspicious sites as they operate. Weisburd said an analyst from a federal agency recently wrote him a scathing letter calling him a “grave threat to national security” because his work was interfering with its investigations.
Marshall Stone, a spokesman for the FBI, said that while the agency encourages citizens to report alleged wrongdoing, it believes any attempt to stop criminals should be left to the government.
Without due process, evidence could be tainted and become unusable in court cases or, worse, targets could be condemned as guilty when they are really innocent, said Paul Kurtz, executive director of the Cyber Security Industry Alliance, a coalition of tech company chief executives. “When we all become ‘law enforcement officers’ justice becomes very blurry,” he said.