The University of California has been selected as the poster child of animal abuse at laboratories. It's been shown that the tactics are more effective if you just hit one person over and over and get them to quit what they're doing.
There are two main goals behind ALF actions. The first is obviously to remove as many animals as possible from fur farms, vivisection labs, and other areas of abuse. The second is to cause as much economic damage to these industries and persons as possible.
I think Dario Ringach is a poster boy for the concept that the use of force or the threat of force is an effective means to stop people who abuse animals," "No strictly peaceful movement has succeeded in liberation," "I think the animal rights movement has been restrained in its use of force, mostly because people in the struggle are often people of privilege who aren't willing to risk losing that privilege.
If animal abusers aren't going to stop perpetrating these types of atrocities, they ought to be stopped using whatever means necessary. What we're starting to see is the implementation of that type of strategy.