While it is normal for lawyers from both sides to talk with jurors following a mistrial, it is highly unusual, at least so far as I know, for the US Attorney to send FBI agents to interview the jurors.
Absent an allegation of something like juror tampering, it simply makes no sense. FBI agents are not trained as jury consultants or litigators, and as such are not the best choice for this task.
So now, at the end what was clearly a political show trial, one in which the prosecution could not meet the burden of proof, we are seeing a highly public harassment of those jurors at the direction of the US Attorney’s office.
When this is all over, U.S. Attorney Mary Beth Buchanan, and the rest of her bully boys, need to be fully investigated over their actions, which are a basic affront to the concepts of laws going back to perhaps the Magna Carta.
If wrongdoing is uncovered, they need to be prosecuted to the fullest extent of the law, with imprisonment and disbarment as the results.