Another source of inflow to SS and Medicare is non-citizen workers. Be they legal or illegal, if they have a legit job in the US, they (and the company they work for) pay into the funds. Few will ever see any of it. Certainly not the illegal ones, and the rules for legal (non green-card holders, with just a work visa) are pretty strict as I recall. Admittedly I have not checked the rules since I retired 8 years ago.
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