Some guy called. He left a message. The message was all broken up. Said to have my attorney call him right away in a rather demanding voice. First of all if I have some kind of problem with the IRS I am sure I will get some kind of paper in the mail. Don't fall for their crap. They are just trying to get money from you. Waste of time.
Theses are Indian scammers. They ignore US law. They buy and sell information from various grey markets. A lot of information is avialable from commerical vendors. Sometimes they simply buy the information from various on-line outfits.
Nothing the US government can do. The scammers are located in India nd beyond the reach of US laws. They are criminals who ignore law. Indian government doesn't do much either.
There's nothing an individual can do except spread the word about the scammers and advise people to block the calls.