Synonyms of 'sympathizer'
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A partisan is someone who is partisan.
At first the young poet was a partisan of the Revolution.
an active protagonist of his country's membership of the EU
Supporters are people who support someone or something, for example a political leader or a sports team.
a major supporter of the 1986 tax reform plan
Thesaurus for sympathizer from the Collins English Thesaurus
The sympathizers of an organization or cause are the people who approve of it and support it.