Answer: dissident

AnswerCrossword Clue
DISSIDENTNaysayer
DISSIDENTIn opposition
DISSIDENTNot agreeing.
DISSIDENTNonconformist
DISSIDENTAndrei Sakharov in the Soviet era, e.g.
DISSIDENTOne casting a "no" vote
DISSIDENTGulag internee, e.g.
DISSIDENTThorn in a dictator's side
dissidentdissenting / a dissenter, esp one who disagrees with the aims and procedures of the government
dissidentA person who opposes official policy, esp. that of an authoritarian state