Dissident

A dissident is a person who actively challenges an established political or religious system, doctrine, belief, policy, or institution. In a religious context, the word has been used since the 18th century, and in the political sense since the 20th century, coinciding with the rise of authoritarian governments in countries such as Fascist Italy, Nazi Germany, Imperial Japan, Francoist Spain, the Soviet Union, North Korea, China, Turkmenistan and the Middle East.