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.
... and died near Zwolle (52 miles east-north-east of Amsterdam) in 1471. His paternal name was Hemerken or Hammerlein, "little hammer."
In 1395 he was sent to the ...