Typical scam call - block the number or ignore the calls. If you were in "trouble with the federal government" you wouldn't find out via a scammy, threatening phone call!
Alyce Wilson from US Treasury called stating that there is a discrepancy in 2010 taxes that may result in criminal charges. Serious foreign accent. got off the phone when I told her I needed to report her call to the police. She said you do what you want.