It's obtaining & using another person's name, social security number & other personal info to commit fraud
They use sensitive 
personal information, such as your Social Security Number, bank account 
numbers,... [DOC] [TLE] Illegal, but Not Undocumented | Center for Immigration Studies [PAR] Instead, illegal aliens commit SSN-only identity theft by obtaining fraudulent 
Social Security cards in their own names, often with random numbers made up 
by dealers.