This is a quote from Rudolf Vrba, who escaped Auschwitz and reported what was happening there to Kastner:
I am a Jew. In spite of that, indeed because of that, I accuse certain Jewish leaders of one of the most ghastly deeds of the war. This small group of quislings knew what was happening to their brethren in Hitler’s gas chambers and bought their own lives with the price of silence. Among them was Dr. Kasztner, leader of the council which spoke for all Jews in Hungary. While I was prisoner number 44070 at Auschwitz – the number is still on my arm – I compiled careful statistics of the exterminations . . . I took these terrible statistics with me when I escaped in 1944 and I was able to give Hungarian Zionist leaders three weeks notice that Eichmann planned to send a million of their Jews to his gas chambers . . . Kasztner went to Eichmann and told him, ‘I know of your plans; spare some Jews of my choice and I shall keep quiet.’ Eichmann not only agreed, but dressed Kasztner up in S.S. uniform and took him to Belsen to trace some of his friends. Nor did the sordid bargaining end there. Kasztner paid Eichmann several thousand dollars. With this little fortune, Eichmann was able to buy his way to freedom when Germany collapsed, to set himself up in the Argentine . . .
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This is a quote from the ruling by Israeli Judge Halevi against Kastner:
It is clear that the positive recommendation by Kastner, not only in his own name but also in the name of the Jewish Agency and the Jewish World Congress was of decisive importance for [Nazi Col. Kurt]
(The Judge also found Kastner guilty of “selling his soul to the devil”, the devil being Eichmann and the deal Kastner struck with Eichmann allowing Eichmann to easily deport Hungarian Jewry to Auschwitz without resistance.)