dissident
dis-si-dent
noun
A person who strongly disagrees with official policies, especially in a repressive state.
"Many political dissidents were imprisoned."
adjective
Expressing strong disagreement with official policies or an established system.
"Dissident groups organised protests."
Thesaurus
Synonyms: heretical, unorthodox, heterodox, objector, dissenter, protester, contestant, dissentient, dissenting, negative