Lord George Bentinck: A Political Biography (1852), Chapter X http://www.gutenberg.org/files/20007/20007-h/20007-h.htm#link2HCH0010. Variations of the bolded portion of this quote have been incorrectly challenged as misattributions based on the seemingly anachronistic reference to communism (which was not yet an important political force at the time), the negative language toward Jews, and the use of such variations by antisemitic agitators who failed to provide an accurate citation to the work in which it appears. See Paul F. Boller, John George, They Never Said It: A Book of Fake Quotes, Misquotes, and Misleading Attributions (1990).
1850s
Context: But existing society has chosen to persecute this race which should furnish its choice allies, and what have been the consequences?
They may be traced in the last outbreak of the destructive principle in Europe. An insurrection takes place against tradition and aristocracy, against religion and property. Destruction of the Semitic principle, extirpation of the Jewish religion, whether in the Mosaic or in the Christian form, the natural equality of man and the abrogation of property, are proclaimed by the secret societies who form provisional governments, and men of Jewish race are found at the head of every one of them. The people of God co-operate with atheists; the most skilful accumulators of property ally themselves with communists; the peculiar and chosen race touch the hand of all the scum and low castes of Europe! And all this because they wish to destroy that ungrateful Christendom which owes to them even its name, and whose tyranny they can no longer endure.