How an IRS Agent Tracked Down the Silk Road's Dread Pirate Roberts

Gary L. Alford was running on adrenaline when he arrived for work on a Monday in June 2013, at the Drug Enforcement Administration office in the Chelsea neighborhood of Manhattan. A tax investigator, he had spent much of the weekend in the living room of his New Jersey townhouse, scrolling through arcane chat rooms and old blog posts, reading on well after his fiancée had gone to sleep.

The work had given Mr. Alford what he believed was the answer to a mystery that had confounded investigators for nearly two years: the identity of the mastermind behind the online drug bazaar known as Silk Road — a criminal known only by his screen name, Dread Pirate Roberts.

When Mr. Alford showed up for work that Monday, he had a real name and a location. He assumed the news would be greeted with excitement. Instead, he says, he got the brushoff.

He recalls asking the prosecutor on the case, out of frustration, “What about what I said is not compelling?”

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