He was the son of Carl Ludwig Ewald von Schlabrendorff (born Berlin, 1854, died Detmold, 1923) by his marriage to Ida von Stockmar (1874–1944), a great-great-granddaughter of William I, Elector of Hesse by his mistress Rosa Dorothea Ritter.
He was trained as a lawyer, later joining the German Army.
1907
Fabian Ludwig Georg Adolf Kurt von Schlabrendorff (1 July 1907 – 3 September 1980) was a German jurist, soldier, and member of the German resistance against Adolf Hitler.
Schlabrendorff was born on 1 July 1907 in Halle.
1939
He married Luitgarde von Bismarck, born at Frankenstein in Silesia (now Ząbkowice Śląskie, Poland) in 1939 and had the following children:
""To prevent this success of Hitler in all circumstances and by all means, even at the expense of a heavy defeat of the Third Reich, was our most urgent task."
Diesen Erfolg Hitlers unter allen Umständen und mit allen Mitteln zu verhindern, auch auf Kosten einer schweren Niederlage des Dritten Reiches, war unsere dringlichste Aufgabe."
1941
As a reserve lieutenant-colonel (Oberstleutnant der Reserve), he was promoted to serve as adjutant (Ordonnanzoffizier) to Colonel Henning von Tresckow in January 1941, a major leader in the resistance against Adolf Hitler, and held this position until July 1944.
He joined the resistance and acted as a secret liaison between Tresckow in Russia and Ludwig Beck, Carl Goerdeler, Hans Oster, and Friedrich Olbricht in Berlin, taking part in various coup d'état plans and plots.
1943
On 13 March 1943, during a visit by Adolf Hitler to Army Group Centre Headquarters in Smolensk, Schlabrendorff smuggled a time bomb, disguised as bottles of Cointreau, onto the aircraft which carried Hitler back to Germany.
The bomb detonator failed to go off, however, most likely because of the cold in the aircraft luggage compartment.
Schlabrendorff managed to retrieve the bomb the next day and elude detection.
1944
Schlabrendorff was arrested following the failed 20 July 1944 Plot.
He was sent to Gestapo prison where he was tortured, but refused to talk.
While imprisoned he met fellow imprisoned co-conspirators Wilhelm Canaris, Hans Oster, Ulrich von Hassell, Johannes Popitz, Carl Goerdeler, Josef Mueller, and Alexander von Falkenhausen.
1945
He was brought before the People's Court of Nazi Germany (Volksgerichtshof) on 3 February 1945.
However, while Schlabrendorff was awaiting trial, the courtroom took a direct hit from a bomb during an American air raid led by Lt. Col. Robert Rosenthal.
The bomb killed Roland Freisler, the president of the People's Court, who was found crushed by a column, still clutching Schlabrendorff's file.
Schlabrendorff did not escape, however, and was arraigned before the court again the following month.
, the vice president of the People's Court, now headed the court.
Following an intense defence, conducted by himself on both legal and procedural grounds (claiming his torture had made the process outrageously unworthy of justice) and in an exceptionally rare instance in its final nine months of existence, the People's Court acquitted von Schlabrendorff on 16 March 1945.
His death was later demanded by Hitler's decree, but the order was defied insofar as it was never carried out.
After his second trial, Schlabrendorff was moved from one concentration camp to another: Sachsenhausen and Flossenbürg, then Dachau near Munich.
In late April 1945 he was transferred to Tyrol together with about 140 other prominent inmates of Dachau, where the SS-Guards fled after being confronted by a regular German Wehrmacht unit led by Wichard von Alvensleben and told to stand down by the Supreme Commander of all SS troops in Italy, who took responsibility for the order.
Schlabrendorff was eventually liberated by the Fifth U.S. Army on 5 May 1945.
As was revealed only 60 years after the fact, Schlabrendorff wrote analyses for the US secret service OSS about the leadership of the Wehrmacht and about war crimes committed by the Nazis.
OSS head William J. Donovan then questioned him personally.
When Donovan became adviser to the American delegation of lawyers at the Nuremberg trials after the dissolution of the OSS, he included Schlabrendorff on his staff.
Schlabrendorff convinced Donovan that it was not the Germans but the Soviet secret service NKVD that had murdered some 4000 Polish officers in the Katyn forest.
Donovan then had the Americans block the Soviet attempt to add Katyn to the list of German war crimes.
1957
Schlabrendorff was admitted to the Protestant Order of Saint John (Bailiwick of Brandenburg), in which he served as Captain of the Order (legal counsellor to the Herrenmeister, head of the Order) from 1957 to 1964.
1967
From 1967 to 1975 he was a judge of the German Federal Constitutional Court.
From 1 September 1967 until 7 November 1975, he was a judge of the Federal Constitutional Court of West Germany, the country's supreme constitutional court, serving in its second senate.
