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

1.
activist
a person who campaigns to bring about political or social change
:
•
She is a well-known environmental activist.
Zij is een bekende milieuactivist.
•
The human rights activist spoke passionately about justice.
De mensenrechtenactivist sprak gepassioneerd over gerechtigheid.