Fifty-one-year-old Norma Prince was sentenced Thursday. Prince pleaded guilty in December.
Prosecutors say the incident happened Jan. 31, 2013, when Prince appeared at a Social Security disability benefits hearing in Wausau.
Administrative Law Judge Thomas Sanzi was presiding over the hearing by teleconference from Madison. Prosecutors say Prince became upset and threatened to shoot Sanzi and cut off his head. The hearing was halted and Prince was escorted from the courtroom.
Prince's husband told a federal agent that his wife had bought two .22-caliber rifles about a month before the disability hearing.
At sentencing, U.S. District Judge Lynn Adelman said Prince's mental health issues can be controlled through medication and supervision.