Animal Liberation Front (ALF) is a name used by people who fight desperately for the protection of animal rights which can even endanger their lives. They remove animals from laboratories and sabotage animal testing laboratories.The Animal Liberation Front is considered an example of leaderless resistance because it is not an organization with membership, but a banner for volunteers to use.

ALF rescued Britches, a monkey which undergone brutal experiments by animal researchers at the University of California, Riverside (UCR) in March 1985.

Due to the ALF's commitment for the protection of animal rights and thus becoming harmful for animal researchers, the United States government listed it as terrorist threat for humans and the FBI launched Operation Backfire to arrest several activists of the Animal Liberation Front.

For an unrelated topic see ELF.