I was called both at home and at work.
I was informed, through extremely heavy accents (non-US) that there was a legal claim pending against me from the IRS regarding taxes filed incorrectly in the years 2003-2013.
I was informed that the IRS had been trying to contact me but that since I was unavailable to sign for a certified letter they were seeking legal action against me. They claimed to be work at/for the IRS.
They told me that I had to talk in person to someone named Steven Thomas, that his title is Chief Investigations Officer and that he works at/for the IRS. They game me a phone number for Steven Thomas of: (202) 280-7970.
I reverse looked up the phone number and it is at Ymax Oration in Hyattsville, MD. I checked the IRS site and they say there have been many phone scams going on. I will call the IRS next, but this whole thing is highly suspect since the IRS always communicates through registered mail.