They called from a unknown phone number, but this is the message I got in voicemail. It wasn’t a person, it was definitely a computer generated voice:

“...Grand jury for a federal criminal offense this is the final attempt to reach you to resolve this issue immediately _⁠_⁠_⁠_⁠_⁠_⁠_⁠_⁠_⁠_⁠_⁠_ to a federal agent callback number 888-294-0641 I repeat 888-294-0641 thank you…”
 May 13th, 2019