In recent years, the Animal Liberation Front (ALF) has become one of the most active extremist elements in the United States. Despite the destructive aspects of ALF's operations, its operational philosophy discourages acts that harm "any animal, human and nonhuman." Animal rights groups in the United States, including the ALF, have generally adhered to this mandate. The ALF, established in Great Britain in the mid-1970s, is a loosely organized movement committed to ending the abuse and exploitation of animals. The American branch of the ALF began its operations in the late 1970s. Individuals become members of the ALF not by filing paperwork or paying dues, but simply by engaging in "direct action" against companies or individuals who utilize animals for research or economic gain. "Direct action" generally occurs in the form of criminal activity to cause economic loss or to destroy the victims' company operations. The ALF activists have engaged in a steadily growing campaign of illegal activity against fur companies, mink farms, restaurants, and animal research laboratories.
Estimates of damage and destruction in the United States claimed by the ALF during the past ten years, as compiled by national organizations such as the Fur Commission and the National Association for Biomedical Research (NABR), put the fur industry and medical research losses at more than 45 million dollars. The ALF is considered a terrorist group, whose purpose is to bring about social and political change through the use of force and violence.
Disaffected environmentalists, in 1980, formed a radical group called "Earth First!" and engaged in a series of protests and civil disobedience events. In 1984, however, members introduced "tree spiking" (insertion of metal or ceramic spikes in trees in an effort to damage saws) as a tactic to thwart logging. In 1992, the ELF was founded in Brighton, England, by Earth First! members who refused to abandon criminal acts as a tactic when others wished to mainstream Earth First!. In 1993, the ELF was listed for the first time along with the ALF in a communique declaring solidarity in actions between the two groups. This unity continues today with a crossover of leadership and membership. It is not uncommon for the ALF and the ELF to post joint declarations of responsibility for criminal actions on their web-sites. In 1994, founders of the San Francisco branch of Earth First! published in The Earth First! Journal a recommendation that Earth First! mainstream itself in the United States, leaving criminal acts other than unlawful protests to the ELF.
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.
Speeches given by Jonathan Paul and Craig Rosebraugh at the 1998 National Animal Rights Conference held at the University of Oregon, promoted the unity of both the ELF and the ALF movements. The ELF posted information on the ALF website until it began its own website in January 2001, and is listed in the same underground activist publications as the ALF.
The most destructive practice of the ALF/ELF is arson. The ALF/ELF members consistently use improvised incendiary devices equipped with crude but effective timing mechanisms. These incendiary devices are often constructed based upon instructions found on the ALF/ELF websites. The ALF/ELF criminal incidents often involve pre-activity surveillance and well-planned operations. Members are believed to engage in significant intelligence gathering against potential targets, including the review of industry/trade publications, photographic/video surveillance of potential targets, and posting details about potential targets on the internet.