http://www.fordham.edu/halsall/source/luther-jews.htmlAt the beginning of his career it is often said that Luther was apparently sympathetic to Jewish resistance to the Catholic Church. He wrote, early in his career:
The Jews are blood-relations of our Lord; if it were proper to boast of flesh and blood, the Jews belong more to Christ than we. I beg, therefore, my dear Papist, if you become tired of abusing me as a heretic, that you begin to revile me as a Jew.
However, sometime before 1517, in his Letters to Spalatin, we can already see that Luther's hatred of Jews, best seen in tis 1543 letter, was not some affectation of old age, but was present very early on. Luther expected Jews to convert to his purified Christianity. When they did not, he turned violently against them.
I did not know this until I heard it on TV the other day. A Google search brings up many sources.
There is nothing new under the sun.