Former federal prosecutor Larry Klayman of Judicial Watch did organize citizen grand juries in Ocala, Florida, in 2013. The grand juries indicted Obama, two SCOTUS judges, and IRS officials for a variety of serios offenses.
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Citizen grand juries cannot issue LEGALLY BINDING indictments. That’s why persons charged under them, ignore them.
An active, duly elected or appointed prosecutor, be that person a city attorney, a county attorney, a district attorney, a state Attorney General, a Special Prosecutor/Independent Counsel or a U.S. Attorney needs to convene the Grand Jury or formally charge (on their own) a defendant with a crime or crimes.