The western world knew that there was something going on over there but didn't really look or care to look and even if they did they weren't shown much. After showing off Dachau to the western world and getting a negative reaction, Germany tended to keep construction and such of camps secret or call it something else. For instance, relocating Jews for safety instead of imprisoning them. Also at this time many nations were anti-Semitic, not to the degree of actually doing much about it, such as France so it wasn't a strange thing for some anti-Semitic rumors in the European world. Another fact is the holocaust didn't really start until at least 1940 because a lot of the camps were in Poland and Poland was captured in late 1939, so maybe early WWII writers saw it beginning but nothing profound was written before.

TL;DR

No, not really. Remember the holocaust didn't start at the same time as WWII and that WWII and the holocaust are no the same thing.