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.
... took to wearing make-up, previously restricted to actresses and prostitutes. Popular flapper make-up styles made the skin pale, the lips red, and the eyes black-ringed. ...