Surely they would have moved heaven and earth to intervene...

"And our only miserable consolation was that we believed that Auschwitz and Treblinka were closely guarded secrets; that the leaders of the free world did not know what was going on behind those black gates and barbed wire; that they had no knowledge of the war against the Jews that H*tler's armies and their accomplices waged as part of the war against the Allies. If they knew, we thought, surely those leaders would have moved heaven and earth to intervene. They would have spoken out with great outrage and conviction. They would have bombed the railways leading to Birkenau, just the railways, just once."

Elie Wiesel, The perils of indifference.