What is the term for open rebellion against authority?

The term that best describes open rebellion against authority is "insurrection." This word specifically refers to a violent revolt against an established authority or government, conveying a sense of organized resistance. While "mutiny" refers to rebellion by soldiers or sailors against their commanding officers, it is more limited in scope and context compared to insurrection. "Revolt" and "uprising" also imply a form of rebellion, but they are broader terms that may not necessarily capture the organized effort against a recognized authority that insurrection denotes. Thus, insurrection is the most precise term in this context.