A handwritten note to Rabbi Yitzchok Dovid Groner, Senior Shliach to Melbourne, Australia was newly published in a recent publication. In the note, the Rebbe MH”M clarifies his position on erecting an eruv in the city with very strong wording • Full Story
Motzaei Shabbos Kodesh, Parshas Emor, 5 Iyar, 5741]
My view is well known that in this generation if a person or organization that people respect were to make an Eruv and he knows that in the end it will become public knowledge – this is a terrible stumbling block, because it is impossible that it will not occur a single Shabbos Kodesh in which the Eruv is invalid – and according to nature if they will become accustomed a number of times to carry [outdoors] on Shabbos Kodesh it will not help any proclamation or announcement that the Eruv has been invalidated and it is forbidden etc. to cause them to stop carrying [outdoors]. And one should not make an Eruv except in secrecy.
From a picture of the Rebbe’s handwritten note on the margin of a letter from Rabbi Yitzchok Dovid Groner (Melbourne) of that date, regarding erecting an Eruv in his city. Published in the pamphlet “An Eruv in Melbourne” (Melbourne, 5748), and from there in numerous other publications. See also along these same lines, Igros Kodesh vol 16 p 308, letter # 6084, and elsewhere.