An international computer hacker pleaded guilty today to multiple charges relating to hacking activity and credit card fraud, announced Assistant Attorney General of the Criminal Division Lanny A. Breuer, Acting U.S. Attorney for the District of Massachusetts Michael Loucks, U.S. Attorney for the Eastern District of New York Benton J. Campbell and Director of the U.S. Secret Service Mark Sullivan. More than 40 million credit and debit card numbers were stolen from major U.S. retailers as a result of the hacking activity.