Soap made from human corpses
Mainstream Holocaust scholars think the idea that Nazis made large amounts of "human soap" is part of WWII folklore. Examples of scholars who believe this include the well-known Jewish historians Walter Laqueur, Gitta Sereny, and Deborah Lipstadt.  Other people who believe this include Professor Yehuda Bauer of Israel's Hebrew University, and Shmuel Krakowski, archives director of Israel's Yad Vashem Holocaust center.  Historian Yisrael Gutman agrees that "it was never done on a mass scale."  And Holocaust historian Robert Melvin Spector says that the Nazis "did indeed use human fat for the making of soap at Stutthof," but in small amounts.