In a boost to the government’s efforts to clamp down on cybercrime, a federal jury has found Ross Ulbricht guilty of running Silk Road, an online drug bazaar described by prosecutors as the most sophisticated criminal marketplace on the Internet.

A jury of six men and six women found the 30-year-old California man guilty of creating and operating a site that started off by selling homegrown illegal mushrooms and eventually swelled into a multimillion-dollar criminal enterprise. Prosecutors say Silk Road offered illegal goods such as cocaine, fake driver’s licenses and computer-hacking tools to thousands of buyers.