What is a Social Security Background Check?

I was browsing job listings and came across this doozy of a condition:

“Must have satisfactory background check inclusive of driving, criminal, employment reference, education, and social security.”

Most of those items make sense. Driving check? Ok I guess if the position involves driving. Education? Yeah, I guess they’ll call the registrar to make sure you really did get that degree. But social security? What could they be looking for? “I’m sorry, your background check indicates that you received Social Security payments in 2011, which does not meet our standards. Best of luck in your future endeavors.”

Maybe verify that the number you provide is actually yours and you’re not using a phony or stolen number.

From here.