The U.S. Justice Department on Monday announced the arrest of a Russian hacker accused of running a network of online crime shops that sold credit and debit card data stolen in breaches at restaurants and retailers throughout the United States.

The government alleges that the hacker known in the underground as “nCux” and “Bulba” was Roman Seleznev, a 30-year-old Russian citizen who was recently arrested by the U.S. Secret Service.

Selzenev was initially identified by the government in 2012, when it named him as part of a conspiracy involving more than three dozen popular merchants on carderbdot]su, a bustling fraud forum where Bulba and other members openly marketed various cybercrime-oriented services.

According to Seleznev’s own indictment, which was filed in 2011 but made public this week, he was allegedly part of a group that hacked into restaurants between 2009 and 2011 and planted malicious software to steal card data from store point-of-sale devices.