President Joe Biden’s nominee to lead the Bureau of Land Management, Tracy Stone-Manning, received legal immunity to testify in a 1993 criminal trial, court documents obtained by the Daily Caller News Foundation show. The trial resulted in a 17 month prison sentence for tree spiking, a violent tactic used to prevent logging. Stone-Manning testified that she sent an anonymous and threatening letter to the Forest Service in 1989 on behalf of John P. Blount, who she identified as her former roommate and a member of her circle of friends, court documents show. The letter warned that a local forest in Idaho set to be logged had been sabotaged with tree spikes, according to the documents. “P.S. You bastards go in there anyway and a lot of people could get hurt,” the letter stated. Tree spiking, which The Washington Post and other news outlets have described as an “eco-terrorism” tactic, is …