Activist (noun)

  1. A person who campaigns for some kind of social change.
  2. A person who is actively involved in politics and social issues.

Origin:

Activism + -ist.

Examples:

  1. He is an environmental activist.
  2. She is a civil rights activist.
  3. The activists gathered in the city center to protest.
  4. The activist group organized a march to demand change.
  5. The company faced backlash from activists for their lack of sustainability practices.
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