>> reporter: a loose collective born on the internet, it has no official members and no hierarchy, but within the group some individual anons have greater standing, earned by their skills as hackers, video makers -- >> to see it with my own eyes and record it myself. >> reporter: -- and increasingly street level activists. troy, not his real name, is one of them. >> this is what happens when the people have had enough. this is what happens when greed goes unchecked. >> reporter: troy said he was drawn to occupy wall street after watching his mother struggle with medical debts. he himself is working two jobs to make ends meet, despite having a college degree. >> you lose track of day, lose track of time but it worth it. it's all worth it. >> reporter: we met him at the occupy wall street camp at the park. >> it's move like a hive, an idea is brought up and whoever agrees with it, if the overwhelming majority of people agree with it, then we go with it. >> reporter: so we're...

stepped into the shadows. >> reporter: it's a dark and disturbing vision. a world where riot police attack with impugnity. >> what happened? what happened? >> he got hit. >> he got shot! >> reporter: where democracy is constructed by greed and dissent is crushed. that's how anonymous sees america and they say that's why they're fighting back. >> we are legion. we do not forgive. we do not forget. >> reporter: it a movement that defies description. leaderless, faceless, anarchic. >> this is our space! >> reporter: a loose collective

>>> tonight on "cnn presents," anonymous. their tactics have created a movement around the world. a rare look inside the shadowy group's secret ops. >> there was a building that was scoring chemicals and cancer causing agents and because of the vicinity and the children that are involved, you didn't care. >> these parents have every reason to be angry. their children's school had toxic chemicals and even worse,