 The "Environmental Life Force", also known as the "Original ELF", was the first radical group to use explosive and incendiary devices to promote pro-environment causes.It was founded by John Hanna, who was the only member of the group to be arrested and convicted for the use of explosives on federal property.Although it was an eco-guerilla entity with similar philosophies to the current ELF (Earth Liberation Front), which formed fifteen years later, there was no formal link between the two groups, and founders of the Earth Liberation Front may not have even been aware of the existence of the Environmental Life Force.