The only people who ever said anything like that are Stalin, Hitler, and their surly ilk: it is a handy way to exterminate selected races and religious groups while not resorting to outright genocide -- although genocide has never been far out of the discussion where liberals are concerned.

I, for one, do not buy leftist/racist games that require malignant paranoid hysteria to convince "The great Jewish conspiracy that they deserve to die in labs, so that we need not torment rats needlessly."  Josef Mengele.

http://en.wikipedia.org/wiki/Nazi