Uprising being commonly repeated in many modern publications. This was even strengthened by the post-war propaganda of the Polish communists, who openly underlined the value of the leftist Żydowska Organizacja Bojowa, while suppressing all publications on the Armia Krajowa-backed ŻZW. The "Contact" ring used as a sign between the ŻZW and the Armia Krajowa is displayed in Yad Vashem. A means of identification, used in particular during meetings of higher level officers, were two identical gold rings set with a red stone engraved with Jewish symbols. It was not enough for the contacts to show the ring, they were expected to explain the significance of the symbols. The ring that was in the possession of the Jewish underground fighters, was destroyed in the ruins of the Ghetto. Its twin remained in the hands of Henryk Iwanski, the Polish underground fighter and later was brought to the museum in Jerusalem, Israel. Doubts about veracity of some accounts In recent years, new research has been published on the ŻZW which has called into question the validity of some accounts, especially by Henryk Iwanski, which had influenced Maciej Kledzik, Marian Apfelbaum, Stefan Bratkowski and Moshe Arens and uncritically transmitted by many of those who wrote about the revolt and which later found their way into many secondary sources. The research of a Polish-Israeli team, for example, has raised many doubts around the veracity of testimony and memoirs by Henryk Iwański, Kalman Mendelson, Tadeusz Bednarczyk, Jack Eisner, David J. Landau, Maurice Shainberg, Joseph Greenblatt and a number of others. Moreover, they have suggested that Dawid Moryc Apfelbaum may actually have been an entirely fictitious figure and that the contact ring, the most emblematic relic of the Revisionist group, is in all likelihood a forgery. Dariusz Libionka and Laurence Weinbaum suggested the manipulations of the Communist secret police as the source of the alleged distortions. "[...] it should be emphasized that deconstructing the story of Apfelbaum and his purported Polish patrons in no way detracts from the heroism of the ŻZW. Just the contrary. To be sure, the ŻZW fought heroically and played a major role in the revolt. Unfortunately, after the uprising was put down, the ŻZW was sentenced to drown in the waters of Lethe." See also Jewish Military Organization Warsaw Ghetto Uprising Żegota Marek Edelman Notes and references In-line: General: Further reading Arens, Moshe, "Flags Over the Ghetto" Apfelbaum, Marian 2007, "Two