Marc Shapiro published a very interesting exchange of letters between R' Moshe and the Seridei Eish in Hamayan 34:2 pg (for some reason that volume is not yet on hebrewbooks.org). The letters concern attempts to persuade a man in Switzerland to give a get to his wife and they show the great efforts taken by these Gedolim to help this woman. I hope letters of this kind will be included in the new collection of R' Moshe's writings as they show his greatness not just as a posek but as a great leader who was genuinely concerned about those who came to him for help .
