Activism, in a general sense, can be described as involvement in action to bring about change, be it social, political, environmental, or other change. This action is in support of or opposition to one side of a controversial argument.
There are many different forms of activism; a select list follows.
... for arranging clandestine air operations in northern France.
Ceux de la Resistance[?]
Ceux de la Liberation[?]
Chantiers de la Jeunesse[?] or "youth camps" - ...