I got the same call today, May 23rd. It's a bit intimidating at first. Nobody wants to hear there are criminal charges pressed against you. Why would the IRS call and not send official notices? Obviously a Scam.
I just received an automated message on my cell phone from someone claiming to be the IRS, stating not to ignore the call and that there are legal charges pressed against my name, and that my and my state ID is under Federal Investigation. The number is (201) 285-8120.