From the Brainroom: The Earth Liberation Front

In 1992, the ELF was founded in Brighton, England

The ELF advocates "monkeywrenching," a euphemism for acts of sabotage and property destruction against industries and other entities perceived to be damaging to the natural environment

"Monkeywrenching" includes tree spiking, arson, sabotage of logging or construction equipment, and other types of property destruction

FBI: The most destructive practice of the ALF/ELF is arson

The ALF and the ELF have jointly claimed credit for several raids including a November
1997 attack of the Bureau of Land Management wild horse corrals near Burns, Oregon

The ELF claimed sole credit for the October 1998, arson of a Vail, Colorado, ski facility,

Colorado ski facility damage exceeded $12 million

On 12/27/1998, the ELF claimed responsibility for the arson at the U.S. Forest Industries Office in Medford, Oregon, where damages exceeded five hundred thousand dollars

SOURCE: FBI, "The Threat of Eco-Terrorism"