Spurred by the murders of alleged plotters of the 1934
Night of the Long Knives, "legitimised" murders carried out on government orders,
without trial or sentence, Dohnányi began to seek out contacts with
German resistance circles. He made records for himself of the régime's crimes, so that in the event of a collapse of the
Third Reich, he would have evidence of their crimes. In 1938, once his critical view of
Nazi racial politics became known,
Martin Bormann had him transferred to the
Reichsgericht in
Leipzig as an adviser. Dohnányi protected
Dietrich Bonhoeffer from conscription by bringing him into the Abwehr with the claim Bonhoeffer's numerous ecumenical contacts could be useful for Germany. Dohnányi covertly went to Switzerland to make certain the refugees would be admitted. The bomb that was smuggled aboard Hitler's plane in
Smolensk after being carried there by Dohnányi, however, failed to go off. On 5 April 1943, Dohnányi was arrested at his office by the
Gestapo on charges of alleged breach of foreign currency violations: he had transferred funds to a Swiss bank on behalf of the Jews he had saved. Among the transactions in question were ones with
Jauch & Hübener. Both Bonhoeffer and Christel Dohnányi were also arrested, although she was released about a month later. Military judge
Karl Sack, himself a member of the resistance, deliberately delayed Dohnányi's trial; however, in 1944, Dohnányi was delivered to
Sachsenhausen concentration camp. His involvement in the
20 July Plot came to light after the plan failed. Also, the Gestapo found some of the documents he had earlier saved and hidden and decided Dohnányi was "the spiritual head of the conspiracy” against Hitler. On Hitler's orders, on 6 April 1945, he was condemned to death by an
SS drumhead court and executed two or three days later (depending on the source). ==Proceedings after the war==