Synonyms of 'demagogue'
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If you describe someone as a firebrand, especially someone who is very active in politics, you mean that they are always trying to make people take strong action.
his reputation as a young firebrand
Thesaurus for demagogue from the Collins English Thesaurus
If you say that someone such as a politician is a demagogue you are criticizing them because you think they try to win people's support by appealing to their emotions rather than using reasonable arguments .