After the war Winston Churchill wished to quote from a letter written to him by Chancellor Heinrich Brüning, then residing at Oxford, England, on August 28, 1937, about the big industrialists who had supported the Nazis before and after their accession to power. Brüning was reluctant to provide any ammunition that might be used against his fellow Germans in “the so-called war crimes trials.” He wrote that Friedrich Flick and the IG Farben company were blameless, having been forced to make their contributions after the Nazis came to power; and added,
“I did not and do not even today, for understandable reasons, wish to reveal that from October 1928 the two largest regular contributors to the Nazi Party were the general managers of two of the largest Berlin banks, both of Jewish faith, and one of them the leader of Zionism in Germany.”
One of the last Reich Chancellors of the Weimar Republic before Hitler came to power, Dr Heinrich Brüning, was enabled to flee to Britain in 1934 (having been provided with a laissez-passer by Deputy Führer Rudolf Hess). From there he made his way to the USA and took up a teaching position at Harvard University.
In private he retained a vitriolic hatred of the German Jews, whom he blamed (in a private 1937 letter to Winston Churchill) for having financed Hitler’s rise to power Brüning’s papers are now housed at the Univ. of Syracuse, New York state, USA. British writer David Irving made these notes from a Brüning MS while researching his biography of Winston Churchill.
Source: http://www.fpp.co.uk/History/General/BrueningMS.html