Most Sinister Hollywood Femme Fatale Ever?

 

   I'll probably have to research this a bit more but as of now I'm going with Gene Tierney's character, Ellen Berent Harland, from the 1945 classic, "Leave Her to Heaven". To call this chick sinister (and Tierney fully own it, by the way) is an understatement of enormous proportions and even though I've seen the flick almost a dozen times, the words, "You're not making very much progress, Danny" (as the kid was about to drown), still haven't lost their sting......and likely never will.