Mein Kampf, volume 1, chapter 3 -

    ...All these were inspired by a general concept of manners and morals which was openly put into practice by a large section of the Jews and could be established as attributable to them. Here, again, the life which I observed on the streets taught me what evil really is.

    The part which the Jews played in the social phenomenon of prostitution, and more especially in the white slave traffic, could be studied here better than in any other West-European city, with the possible exception of certain ports in Southern France...

    A cold shiver ran down my spine when I first ascertained that it was the same kind of cold-blooded, thick-skinned and shameless Jew who showed his consummate skill in conducting that revolting exploitation of the dregs of the big city. Then I became fired with wrath...