The man at the center of the country's largest identity theft ever is a former government informant.
    
At one time, Albert Gonzalez helped the U.S. Secret Service track down hackers.
    
Prosecutors now say 28-year-old Gonzalez hacked into retail networks and stole 130 million credit card numbers.
    
He targeted accounts at stores like 7-Eleven and the Hanaford Brothers Co. supermarket chain.
    
The Miami man is already awaiting trial for another hacking case. He faces up to 20 years in prison if convicted of the new charges.