Go as far back as you think necessary. There are going to be a ton of them from the occupy time period. As long as it's got a news article along with it. Part of this is to eliminate some of those "no true scotsman" defenses that liberals are so fond of using.
http://www.cnn.com/2013/02/06/justice/dc-family-research-council-shooting/ Gay rights activist tries to kill conservatives at Family Research Council and smear Chic-Fil-A in their faces
Alright then, here's a great one to start out on:
http://abc7news.com/archive/8700407/Basically, Occupy Oakland Patriarchy (The militant- feminist wing of Occupy Oakland, which was easily one of the most radical, lawless, and violent Occupy chapters) was actually protesting AGAINST a conference designed around fighting human trafficking and the exploitation of children.
The news story I linked to doesn't talk a lot about the details of what happened that day, but other slightly less official sites go into more detail (i.e. the great Zombie on PJmedia was there, and posted an excellent expose of the protesters with lots of pictures).
The conference itself was a wonderful show of bipartisan unity and people with a wide variety of differing views setting their differences aside and trying to find ways to work together for the common good. The attendees included politicians from all different parties, religious leaders from all different faiths (After all, religious- based groups have done a LOT to combat human trafficking), and (This may have been what made the Occupy freaks the angriest) representatives from different branches of law enforcement, all coming together to figure out ways to better stand against this great evil. Occupy Oakland Patriarchy, however, hated the entire idea of the conference, and thus were sort of coming out as being IN FAVOR of child sex trafficking.
Many of not most of the protesters openly admitted they had no problem whatsoever with child prostitution. One protester proudly waved a sign saying "END POLICE TERROR AGAINST MINOR AND ADULT SEX WORKERS."
This wouldn't have been quite so bad if maybe, in the aftermath of the protest, members of one of the other Occupy chapters had openly condemned or at least criticized Occupy Oakland Patriarchy's repulsive actions, but not a single one of them did, and the DUmmies of course gave the story little to no mention.