One of the supporting facts presented is that, in the Supreme Court appeal of the original verdict implicating Kastner, all five Supreme Court Judges upheld Judge Halevi's initial verdict on the "criminal and perjurious way" in which Kastner after the war had testified on behalf of Nazi war criminal Kurt Becher.

[1] Judge Silberg summed up the Supreme Court finding on this point: "[respondent Malchiel] Greenwald has proven beyond any reasonable doubt this grave charge.

[3] In a 2007 Jerusalem Post opinion column, Elliot Jager called Perfidy "a devastating account" of Rudolf Kastner's betrayal of Hungarian Jewry.

[4] Jerome A. Chanes, writing for The Jewish Daily Forward in 2009, described Perfidy as an "ill-conceived and irresponsible anti-Kastner" account.

She mentions Hecht's involvement with the Bergson boys and says, "much of what he's writing is Kastner as a foil for attacking Ben Gurion, for attacking the Labor Party, and he makes claims in there about the Labor Party, about Ben Gurion, not caring about what was going on in Europe, which is, again, historians now show, has simply not stood the test of time.