"In June 1944, John W. Pehle, the executive director of the War Refugee Board, appealed to the U.S. government to bomb the railways leading into Auschwitz. In July, Johan J. Smertenko, the executive vice chairman of the Emergency Committee to Save the Jewish People of Europe, sent a letter to President Roosevelt asking him to bomb the extermination camps, especially the “poison gas chambers of [the] Auschwitz and Birkenau camps.”"
https://warfarehistorynetwork.com/article/why-wasnt-auschwitz-bombed/
Heres an article with some names. 5 min research.
"In June 1944, John W. Pehle, the executive director of the War Refugee Board, appealed to the U.S. government to bomb the railways leading into Auschwitz. In July, Johan J. Smertenko, the executive vice chairman of the Emergency Committee to Save the Jewish People of Europe, sent a letter to President Roosevelt asking him to bomb the extermination camps, especially the “poison gas chambers of [the] Auschwitz and Birkenau camps.”" https://warfarehistorynetwork.com/article/why-wasnt-auschwitz-bombed/