The phrase "activist phase" is correct and usable in written English.
It can be used to describe a period in which an individual or group is actively engaged in advocacy or activism for a particular cause.
Example: "During her activist phase, she organized several rallies and campaigns to raise awareness about climate change."
Alternatives: "advocacy period" or "activism stage".
In close collaboration with Catholic rulers, often as their confessors, the Jesuits embodied the activist phase of Catholic reform that is known as the Catholic Reformation.
This later "activist" phase became more directly political and was represented by the plays of Ernst Toller, which called for a socialist revolution.
Australia's happy-go-lucky anthropomorphic koala, Blinky Bill, has long been a proponent of environmental conscientiousness, but went on something of an activist phase in the decade before the turn of the century.
Or is it a caricature of a small band of naïve and self-righteous young people passing through an "activist phase" of their lives that they'll grow out of soon enough?
In a statement, SeaWorld officials said the lawsuit was part of a series of efforts by activists to phase out zoos and aquariums.
Activists stage protests.
But with their ranks thinned by summer, he said, they decided to move to the next phase of activist engagement.
Kevin took me over next door to his old home to meet Mama Tessie, a neighborhood mother and activist still living in Phase Three public housing.
On Thursday morning, this fierce ground war will enter its crucial final phase as activists from all parties zigzag the constituency in a last attempt to get out the vote.
Just as the last great wave of party reform, in the late 1960s, took control from party bosses and gave it to a new generation of activists, perhaps the next phase should entail broadening that power to include less ideologically rigid voters — by allowing independents to vote in all primaries.
One of the greatest dangers the world faces is the possibility that a vocal minority of anti-nuclear activists could prevent phase-out of coal emissions.
