Synonyms of 'iconoclast'
Dissidents are people who disagree with and criticize their government, especially because it is undemocratic.
A heretic is someone whose beliefs or actions are considered wrong by most people, because they disagree with beliefs that are generally accepted.
He was considered a heretic and was ridiculed for his ideas.
Thesaurus for iconoclast from the Collins English Thesaurus
If you describe someone as an iconoclast , you mean that they often criticize beliefs and things that are generally accepted by society .