Four enviromental activists connected with the Earth Liberation Front and the Animal Liberation Front have plead guilty in federal court to participating in a five year campaign of arson crimes, a move that could net them each several years in prison. That brings to a total of 12 guilty pleas federal prosecutors have squeezed out of the clatch of so-called eco-terrorists wanted for attacks in several states whom they arrested in December. Mother Jones ran a searching piece on their most spectacular attack, the firebombing of a Colorado ski resort, shortly after it happened. And here’s some background on the post-9/11 crackdown on eco-terror.