We are all frustrated by corrupt legislators, executives, judges, and sheriffs, but we should give some attention to corrupt prosecutors. They are the ones who refuse to take a meritorious case to a grand jury or to prosecute it because it goes against powerful interests or involves fellow officials.
In British law private prosecution is a criminal prosecution that is prosecuted by a private prosecutor, either working pro bono or being paid by interested parties, such as the victims of a crime or his survivors, family, or friends.
Private prosecution is not an established practice in the United States, but a review of state and federal statutes finds no exclusion of it, either.
To get the grand jury system to work as intended, we need to revive private prosecution.