And, they have access then to a lot of sensitive personal information and doubtless U.S. government and corporate information. They could take over the U.S. through created viruses, trojans, etc. WHY would we want to put ourselves in such a vulnerable position? Stupid is as stupid does.
Plan your future appropriately.
They could take over Walmart in minutes. About 80% or more of the IT staff at Walmart is Indian now. An American cant get a computer job at Walmart anymore. It went critical in the last year.
When I worked for bank of America, on their mortgage processing systems, back around 2010. I could shut down that baby with 1 SQL statement for many hours. It would take that long to restore it from backups. If I worked on it for a few days, I could incrementally mess up the backups and cause utter havoc for weeks. But it never occurred to me to do this because I would never want to hurt so many of my fellow countrymen. Is there any precedent for this?
If your organization hires H1-Bs and they are given access to your systems and networks you can be assume that any test data, production data, confidential data, etc. is compromised.