This is undoubtedly a scam. If you are being criminally prosecuted by the IRS, the IRS does not call and tell you that you are being prosecuted. These calls are typically made in the evening, long after the IRS has closed for the day. If the threat of criminal prosecution is also coupled with a request for your credit card number, the call is certainly a scam. Write down the person’s name, badge number and telephone number. Also write down the telephone number listed on the Caller ID. These types of calls should be reported to the IRS.