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.
... families residing in the town. The population density is 1,549.2/km² (4,010.1/mi²). There are 6,949 housing units at an average density of 546.4/km² ...