Claimed to be US Treasury about an Enforcement Action and to call an agent at 301-358-0786.  To ignore is a intentional second attempt to avoid a Grand Jury appearance for a criminal offense.

got a call from this number, left message on my answering machine to call this number for a treasury agent some crap about a second notice and grand jury and charges and so on. they need to get to the bottom of who is making these calls

Ditto to what Steve wrote on 06/22. Verbatim

caller ID "unavailable".  Left cryptic message that I could be called to appear before the US Magistrate and this was their last attempt to reach me.  It was threatening with no identifying information whatsoever - just to call  "or else"  I blocked the number

same here