There is a pretty common theme in pulp period stories involving Nazis of the Nazis being involved with searching for or wielding evil magic. To me, this is most associated with the Indiana Jones movies. In Raiders of the Lost Ark, one of the government men who hires Jones says that Hilter is "obsessed with the occult." In fact, Hitler was not, but Himmler, the head of the SS, was fascinated by the occult.
I'm curious where this originated, since I suspect that it must have been around before Indiana Jones. Of course, there are two slightly different version of this motif; there is a more realistic version and a fantasy version in which the magic is real. I am primarily interested in the fantasy version, but I wouldn't mind hearing about how the more realistic version influenced development of the occult Nazis theme.