In America, the Massachusetts Bay Colony impaneled the first Grand Jury in 1635 to consider cases of murder, robbery and wife beating. As early as 1700, the value of the Grand Jury was recognized as opposing the Royalists. These colonial Grand Juries expressed their independence by refusing to indict leaders of the Stamp Act (1765), and refusing to bring libel charges against the editors of the Boston Gazette (1765). A union with other colonies to oppose British taxes was supported by the Philadelphia Grand Jury in 1770.
https://www.sanmateocourt.org/court_divisions/grand_jury/history.php
Sounds like a patriot.