[2] After the outbreak of World War II, Ehrlich made his way to the part of Poland that had come under Soviet control.

[3] He was asked to join the newly formed Jewish Anti-Fascist Committee, headed by Solomon Mikhoels.

[6] Eleanor Roosevelt and Albert Einstein made direct appeals to Stalin for their release.

[7] According to some sources Ehrlich, unlike Alter, was never executed, because he managed to commit suicide[8] by hanging himself from the bars of his prison window.

As late as February 1943, letters from "Henryk Wiktor" (first names of Ehrlich and Alter) were being circulated in the Warsaw Ghetto.

[10][11] While the exact place where he was buried is unknown, a cenotaph was erected at the Jewish cemetery on Okopowa street in Warsaw on 17 April 1988.

The establishment of the monument (as well as the publication of the full story of Alter and Ehrlich) was opposed by Poland's post-war communist government and was only made possible because of the efforts of Marek Edelman (last surviving leader of the Warsaw Ghetto Uprising and a Bundist) and members of the Polish Solidarity Union.