Usage Note
Extremista is both an adjective (un grupo extremista) and a noun (un extremista), following the invariable -ista pattern, so the form is the same for masculine and feminine. It spans the political spectrum: extremismo de derecha (right-wing extremism) and extremismo de izquierda (left-wing extremism).
Examples
"Las autoridades vigilaban las actividades del grupo extremista."
Natural Translation
The authorities monitored the extremist group's activities.

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