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.

Borrowing the kind of tactics used by anti-abortion demonstrators, animal rights activists are increasingly taking their rage straight to scientists' front doors. 

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