How to Say "campaigner" in Spanish
The Spanish word for “campaigner” is “cruzado” — B2 level.
English → SpanishB2
nounB2formal
someone fighting for a cause

Examples
Ricardo Corazón de León fue uno de los famosos cruzados.
Richard the Lionheart was one of the famous crusaders.
Los cruzados marcharon hacia Oriente Medio en el siglo XII.
The crusaders marched toward the Middle East in the 12th century.
Feminine Form
The female equivalent is 'cruzada' (the woman) or 'la Cruzada' (the event, the Crusade itself).
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