activists
An activist is a person who works to bring about political or social changes by campaigning in public or working for an organization.
agitator , protester
The police say they suspect the attack was carried out by animal rights activists.
警方说他们怀疑这次袭击是由保护动物权利的激进分子实施的。
Dobson blames activist judges for undermining families with favourable gay-marriage rulings.
多布森责备激进派法官们通过赞成同性婚姻的裁决破坏家庭。