the.com/dissident

means A person who openly opposes or refuses to accept the official beliefs, policies, or authority of their government or institution.

from From Latin dissidentem — 'sitting apart' — built from dis- ('apart') plus sedere ('to sit'). The image is almost architectural: everyone else is seated together in agreement, and the dissident has pulled their chair to the other side of the room. English picked it up in the 1600s for religious nonconformists before it drifted toward the political sense we use now, especially sharpened during the 20th century to describe those who publicly broke with authoritarian regimes.