How Bush's grandfather helped Hitler's rise to power

His business dealings, which continued until his company's assets were seized in 1942 under the Trading with the Enemy Act, has led more than 60 years later to a civil action for damages being brought in Germany against the Bush family by two former slave labourers at Auschwitz and to a hum of pre-election controversy.

The evidence has also prompted one former US Nazi war crimes prosecutor to argue that the late senator's action should have been grounds for prosecution for giving aid and comfort to the enemy.

The most tantalising part of the story remains shrouded in mystery: the connection, if any, between Prescott Bush, Thyssen, Consolidated Silesian Steel Company (CSSC) and Auschwitz.