: one who advocates or practices activism: a person who uses or supports strong actions (such as public protests) in support of or opposition to one side of a controversial issue
Antiwar activists were protesting in the streets.
an environmental activist
political activists
The conventional wisdom is that young people no longer care enough to stand up for what is important; that the days of activism and protest have faded into the past, the bailiwick of aging hippies and activists.The Easton (Massachusetts) Journal
: advocating or practicing activism: using or supporting strong actions in support of or opposition to one side of a controversial issue
For the activist groups that will carry the nomination fight to the public, the name of the game is hit early and often. Richard Lacayo
Pressing demands that are both global and granular, the activist investor has turned himself into one of the food sector's most influential players, affecting how millions of people eat each day. Julie Jargon
They plan to become activist shareholders who will protest global-warming resolutions and anything else that undermines corporate profitability. John J. Miller