Reading some blogs I'm subscribed to, I found some interesting articles about ISM and other security fence protesters. I won't quote, I'll just offer some links.
My Internet tour:
ISM Undercover -> Cameo Appearances -> Ah... meet Lazer (a comment on the previous page) -> A typical protest Part I - on the way to a protest -> A typical Protest - Part II - the violence begins
I suggest to read not just the articles, but also the comments by other people.