A lawyer for the group of 23 activists who have signed the complaint of war crimes against the president said Calderon's offensive against drug cartels had involved about 470 cases of human rights violations by the army or police.Remember, if you are a recreational user of illegal drugs you are a contributor to this mess.
The activists accuse Calderon of systematically allowing troops to kill, kidnap and torture civilians.
As for the question, per Wikipedia, an activist is anyone with a pulse and an interest in the betterment of society, like, for example, the Tea Parties. As for OWS, while they have a pulse, I am not sure they are for the betterment of society or not. I worry they are for the regimentation of society.
Regards — Cliff