 He was convicted of 13 acts of treason on November 15, 1949.A motion for a new trial was denied on December 15, 1949, and five days later, on December 20, 1949, Judge Alexander Holtzoff sentenced Burgman to imprisonment for 6 to 20 years.On February 8, 1951, the use of electrical transcriptions of his wartime broadcasts in his treason trial was upheld by the U.S. Court of Appeals.