On October 26, 1938, he was appointed as the special prosecutor to supersede the district attorney of Kings County in connection with investigation of official corruption in Brooklyn.[1]
Amen served on the prosecution for the Murder Inc. killers.[2] His investigation eventually led to the dismissal of nearly a dozen police officers for accepting fraudulent bonds.[3]
Military career
He served as a 2nd lieutenant in the United States Marine Corps Reserve Flying Corps.[1]
During the Nuremberg trials, he served as the Associate trial counsel, chief interrogations division office for the United States Chief of Counsel in war criminal trials at Nuremberg from 1945 to 1946.[1][2]
Personal life
He married Marion Cleveland Dell, the daughter of former PresidentGrover Cleveland, on July 25, 1926. John and Marion Amen had one son, Grover Cleveland.[1]