Upon researching Yad Vashem, the memorial for Jewish victims of the Holocaust in Israel, the idea for such a memorial was first proposed in September 1942. However, if I recall correctly, the full extent of the Holocaust was not discovered until 1944.

If this is the case, to what extent did non-European Jews know what was going on? Was there any skepticism to the "rumours" or was there a general consensus?

And on that note, did the Jewish diaspora, particularly Zionists, try to help their European counterparts in anyway such as smuggling them to the Palestine region or to the UK/US?