Fake Federal Agent Scam has been going around for years.  Federal Agents like FBI or IRS will NEVER contact you by phone to make threats or demand money--official contact is always by mail, and threats are forbidden by law.

Thick accent foreigners who do not understand meaning of terms like Magistrate or Grand Jury, and who say laughably stupid things like "There is a lawsuit against the last four digits of your Social Security Number."

You are an angel who has confirmed my suspicions. Thank you