Nathan Allen Danforth, who previously threatened to kill 3 presidents, sentenced for threatening to blow up federal courthouse Updated Jan 26, 2021; A former Massachusetts inmate was sentenced Tuesday for threatening to blow up a federal courthouse and harm federal agents. Nathan Allen Danforth, previously a federal inmate who was transferred to FMC Devens for mental health and long-term care issues, was sentenced to three years after he pleaded guilty to making threats against federal agents and threatening to cause an explosion at a federal courthouse in Florida, according to U.S. District Attorney Andrew E. Lelling’s office on Tuesday. This is the third time Danforth has been sentenced for making threats against government officials and buildings.