By shutting down the notorious Silk Road criminal marketplace, federal law enforcement is succeeding at infiltrating the most sinister areas of the hidden Internet, experts say.

On Tuesday, the Federal Bureau of Investigation arrested in San Francisco Ross William Ulbricht, 29, alleged owner and mastermind of the infamous site, according to a complaint filed by the U.S. Attorney's Office in New York. Ulbricht, a.k.a. Dread Pirate Roberts, has been charged with conspiring to money launder, hack computers and traffic in narcotics.

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