Read full text: https://market-ticker.org/akcs-www?post=252769
If the system shows the same SSN or ITIN in more than one place send ICE to both of them to find out what's up assuming it is not facially reasonable that this is one person working two jobs.
Obviously if you see the same number coming from a bunch of places its stolen.
Go raid the workplaces. All of them. The one that is American? He or she is good. The others? If they passed E-Verify then arrest and deport the employee -- and bar them permanently for felony identity theft along with their illegal entry.
If the E-Verify control number isn't there or its fraudulent then everyone in the executive suite of the company goes to prison for five years per employee per 8 USC 1324(a)(3) and the illegal(s) get deported.
People try to evade this using 1099s? Nope; anyone paying people on 1099s must either (1) run E-Verify for each person they pay on a 1099 or (2) use a job shop which they identify and the job shop must E-Verify each and every person.
If the job shop cheats imprison all of their executives.
I've worked directly on a 1099 basis and also through a job shop and in both cases I had to identify myself in exactly the same way I did as a W-2 employee and prove my bona-fides. I know the same is true today for legitimate job shops because I know people who work for them and every single one of them had to provide the expected and usual identification including a Social Security card and evidence of citizenship such as a "Real ID" driver license or Passport.
This is not complicated; you can essentially render all illegal alien employment uneconomic and impossible inside of 90 days.