activista

n. activist, one who advocates active involvement as a means to achieve political or other goals; militant, one who has aggressive or combative tendencies

= activist.
Ex: The Fawcett Library's collection of materials concerning the feminist theorist and activist, Teresa Billington-Grieg, is described.
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* activista contra el consumismo = consumer activist.
* activista ecológico = eco-warrior.
* grupo activista = faction group.