Laws that forbid the carrying of arms are laws of such a nature. They can, however, be extremely successful in subverting civil liberties and increasing governmental power. They invert the presumption of innocence. A grand jury exists to decide if there is sufficient evidence to indict someone, i.e. bring them to trial. If the grand jury says no, no trial happens.
Grand juries operate in secret, and are selected at random from the population.
Or that's how it's supposed to be. They also have subpoena powers. The U.S. constitution guarantees that noone can be brought to trial for a criminal offense unless a grand jury indicts them. Linda Hamilton's case never appeared before a grand jury. The primary reason I'm linking to this post is another response from proff daddy.