Ted Kaczynski (born May 22, 1942) (better known by his alias as the Unabomber) is a very notorious real-world terrorist/bomber who engaged in a reign of terror lasting nearly 20 years before he was finally captured: his bombings killed three people and injured 23 others. He was of Polish ethnicity. In his writings to newspapers and family, he would engage in emotional cruelty towards his parents and victims, indicating that he's a sadist.
He is perhaps one of the most extreme examples of an eco-terrorist he had lived in isolation in a cabin for a long time, scavenging small amounts of food from the wild, while regularly riding his bike to a town to restock food and supplies, and grew agitated when the wilderness around his home started undergoing development - thus Ted began his mail bombing campaign: sending his bombs to universities and airlines, among other targets.
Ted would admit to authorities that he knew his actions were "extreme" but he felt they were justified as a means of warning people about the dangers of modern life and what he viewed as the erosion of human freedom caused by technology and modern living.
He is current serving a life sentence for his crimes, despite the gravity of his offenses some prominent anarcho-primitives (a branch of environmentalism / anarchism) have come to his defense - though almost all who have spoken publicly on the matter disagreed with Ted's methods.