activist
US /ˈæk.tə.vɪst/
UK /ˈæk.tə.vɪst/

1.
activista
a person who campaigns to bring about political or social change
:
•
She is a well-known environmental activist.
Ella es una conocida activista ambiental.
•
The human rights activist spoke passionately about justice.
El activista de derechos humanos habló apasionadamente sobre la justicia.