Trial by Jury - Thomas Jefferson considered it “the only anchor ever imagined by man by which a government can be held to the principles of its constitution.”
Jury nullification makes that possible, which is why the government doesn’t want us to know, learn, or use it.
https://tenthamendmentcenter.com/2024/10/10/jury-nullification-how-we-the-people-can-overrule-the-government/