It is ridiculous to call ELF and ALF terrorist groups, and group them in the same category as Al-Qaeda. At worst ELF and ALF are arsonists and burglars.
Some or all of them literally believe that the life of a lab rat is equivalent to the life of a human and they've sent terroristic threats to researchers, farmers, meatpackers, etc. They set off pipe bombs and commit arson and break into labs and destroy research records.
In spite of their supposed love for animals many beautiful horses have been burnt to death in their fires.
If I were working in an animal-related field and they sent me a death threat I'd take it very seriously.