A couple that I'd include:
1. Earth First. They included ALF and ELF, but neglected the older terrorist group that they were direct spinoffs of. Earth First has engaged in numerous acts of environmental terrorism, openly supported violent ecoterrorists, and the Unabomber was a proud member of Earth First, who chose his targets using Earth First's "Eco- F**ker Hit List."
2. SHAC (Stop Huntingdon Animal Cruelty). Another ecoterrorist group, this one focused on bringing down one company: Huntingdon Life Sciences. Opposed to the company's practice of animal testing and reported mistreatment of animals, SHAC repeatedly launched a variety of vicious attacks and other terrorist tactics against the company and its partners and suppoorters. One HLS director in the UK, upon returning home from work, was jumped and viciously beaten by SHAC thugs wielding baseball bats, who then pepper- sprayed a neighbor who tried to intervene. ANother HLS director had corrosive spray blasted in his eyes by SHAC assailants, temporarily blinding him. Fortunately, SHAC appears to be a thing of the past, as it announced it was shutting down its campaign a couple years ago.