Ask the Declaration → Your rights, by who you are
Jury service is one of the few times an ordinary citizen exercises a piece of government power directly. The Constitution builds the jury into both the structure of the courts and the rights of the accused.
Descriptive, not legal advice · the founding documents' own words
The trial of all crimes, except in cases of impeachment, shall be by jury. Jury trial is written into the judicial power itself, not only the Bill of Rights.
In criminal cases the accused is entitled to trial by an impartial jury of the state and district where the crime occurred. As a juror, you are that guarantee in practice.
In civil suits at common law above a threshold, the right to a jury is preserved, and a jury's findings of fact are shielded from re-examination.
A grand jury stands between the government and a serious federal charge: no one answers for a capital or infamous crime except on its presentment or indictment.