Indian guy left me a message, not sure what he is really offering or trying to do, but it is obvious that it is something shady. His message is obviously intended to be used for a large number of random strangers, yet at the same time sound as though it is specific to whatever individual is hearing it. He claimed the IRS had filed some charges under "my name" and it needed to be addressed very soon or I could be arrested. I was curious why the IRS would be trying to reach me on a throwaway, non-contract Metro PCS phone that was registered to a made up name though ; )

Same as above, left the message and the wife called back.  Yes, I told her to NEVER do that!  Said his name was Tom calling from the IRS, threatened her with the filing of a court case, the whole nine yards.  It's been reported to the local sheriffs office and our local IRS office as well.

No gentleman.  Total scammer.

Total scam.  Originates in either India or Pakistan.   Block and ignore.   DO NOT RETURN THE CALL!
See:  http://www.irs.gov/uac/Newsroom/IRS-Reiterate ... -Telephone-Scam

Report them:
https://www.treasury.gov/tigta/contact_report_scam.shtml
I’m an Enrolled Agent with the IRS (Inactive). IRS does not initiate contacts by phone.  US mail only.   IRS does not file lawsuits.  IRS has enough administrative authority under the IRS Code and related regulations to collect all taxes lawfully due the federal government.     Court action, if any is handled by the DOJ and all parties are entitled to legal assistance if it is a criminal matter.  But--tax disputes are for the most part civil matters.  90% of all IRS tax disputes are settled administratively.  IRS has absolutely no authority to call on local law enforcement for anything. Local law is never involved in IRS tax disputes. IRS does not threaten to involve local law enforcement or to arrest you for nonpayment of federal taxes.  IRS has no powers of arrest as related to ordinary tax disputes.  Having a deficiency in taxes owed by way of audit is NOT a crime.  IRS does not cold call anyone and demand immediate payment of  money.  IRS does not ask for financial information over the phone.   IRS does not accept Green card money paks for payment in any case.  No one is prosecuted for ordinary tax disputes. IRS has absolutely no authority over anyone's professional license. Professional licensing is handled by state governments.  Yes, levies on property to satisfy an existing tax obligation do occur, but only after a very long period of negotiation. And yes, liens are placed on individuals but  usually after a lot of negotiation and a failure to reach a settlement.    All determinations of tax liability are subject to appeals.  All  contacts by the IRS are initiated by US mail.
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This guy keeps calling to tell me he is from the IRS, however, if the caller ID is not the IRS.  I wish he would quit calling me.  Can the IRS intervene and take legal action against him?  is there a lawyer that will file a class action lawsuit against him?

To take legal action you have to find them and get them arrested.  Most of these calls come from outside the US, from 3rd world countries where scamming dumb Americans is not illegal and local police do not cooperate with the US FBI or other law enforcement groups.  The scammers cannot be caught.