IRS DOES NOT SUE ANYBODY. People are so freaked out over the IRS that this scam has become very profitable. These people should be put before a firing squad.
Left 2 messages on the answering machine stating it was the IRS and filing a lawsuit. Called the number and "Punjab" ( that is what I will call him since he did not identify himself) answered. I let him know the IRS will never call and leave such a message and hung up.