Great Juries operate much like the customs of a Grand Jury, however Great Juries are not private membership association specific meaning a secret society has no influence on a Great Jury. This means that the Great Juries are autonomous according to customary law. Residents and American Nationals that are not General Post Masters are qualified to sit on a Great Jury and must sign the Declaration of Rights of the Declared Resident and affirmed American National for The United States of America in order for the Great Juries to have any standing. LINK
Great Juries can issue an Indictment of agreement, or presentment of facts and findings of a certain event or situation. Great Juries have county, State, National and International jurisdiction to hear evidence of possible wrong doing. Each level has an address assigned and a number assigned to make sure that the Great Jury has an address and identifier. Map
Please keep in mind that the purpose of the Great Jury is to either agree that a crime has been committed or present the facts and findings of a particular case if the Great Jury cannot all agree. That is it, the Judicial Branch of the Government of The United States of America carries out the rest of the Judicial Process in accordance with its laws.
The one supreme court was the original court reserved to the people, however the people have not been aware of its existence for a long time. It has a lot of power and authority and must be used with Great care and responsibility. It is a double edged sword.