This is something the Trump administration should consider in an EO. It should inform the SSA to immediately contact employers where a SS number associated with an employee at their location is being used at an alternate location. Advise both the companies of the daily fine and give them 30 days to confirm legitimacy of the associated employee.
SSA has had a handle on the real truth from day one when they started using computers. They know anything and everything about any number, real or false. They don’t do anything about the multiple uses of one number because they only have to pay out according to the legitimate owner, and they damned sure don’t credit his account with the extra payments that will net him more retirement money.
They KNOW - they’ve known for decades.