The letter should raise questions and should be investigated. The news shows the pattern of criminal activity and convictions in the past with this group. Judge Silver had a death threat in 2003. Her concern is justified and a letter like this:
http://leonidas.cactuspilots.us/West_Pilot_DFR_DJ/Doc_285_Letter_filed_by_James_H._Anderson.pdf
is at the least an underhanded attempt to influence her decision.
Stewart death threat case
Judge Silver received a death threat in 2003. She was threatened when 64-year old prisoner Robert Stewart offered another inmate $100,000 in a secret cache of machine guns to kill Judge Silver.
[3] Silver had sentenced Stewart to five years in prison on a federal weapons charges. In a recorded jailhouse conversation, Stewart, who has ties to militia groups, issued the death threat. Stewart requested that the judge's head be cut off and hung from a pole in hopes that it would spark more killings of federal agents and judges nationwide and lead to an uprising by anti-government groups. Later in 2003, Stewart was sentenced to 24 years in prison after he was convicted for soliciting the murder of a federal judge. Stewart is concurrently serving that sentence in addition to the original five year sentence that was issued by Judge Silver.
[3]
http://judgepedia.org/Roslyn_Silver