Earlier today, I posted a review of The Animal Research War, which details the lengths that animal rights extremists are willing to go to in order to further their cause. Coincidently, the AP yesterday published a detailed article on the rise of animal rights extremism in the US. Here's a taste:

In the hills above the University of California's Berkeley campus, nine protesters gathered in front of the home of a toxicology professor, their faces covered with scarves and hoods despite the warm spring weather.

One scrawled "killer" in chalk on the scientist's doorstep, while another hurled insults through a bullhorn and announced, "Your neighbor kills animals!" Someone shattered a window.