I just received a call today (on my answering machine). Said it was the Fraud Department of the IRS and that there was tax fraud against my name, and call soon to avoid a warrant for my arrest.
Same thing, only a woman this time with a thick Indian accent. When she asked if there is anyone who could represent me in a courthouse, I knew it was fake, so I hung up. I'm in Colorado, caller ID said the call came from Virginia.
I reported the incident here: http://www.treasury.gov/tigta/contact_report_scam.shtml
Jason O'Conner with thick Indian accent says I too have IRS problems. I called back and got the same voice and accent but the name is now Mark Robinson. I asked him to use his real name and give me his address and he became real indignant and hung up.