Dissent was strong disagreement or dissatisfaction with a decision or opinion, especially one that is supported by most people or by people in authority.
In 2366, the Zalkonian Sunad described the individual "John Doe" as a disruptive influence who spread lies, encouraged dissent and disturbed the natural order of Zalkonian society when questioned by Captain Jean-Luc Picard about his supposed crimes. (TNG: "Transfigurations")