According to Pacelli:
"...in the midst of all this, a gang of young women, of dubious appearance, Jews like all the rest of them, hanging around in all the offices with lecherous demeanor and suggestive smiles.
The boss of this female rabble was Leviné's mistress, a young Russian woman, a Jew and a divorcee, who was in charge. And it was to her that the nunciature was obliged to pay homage in order to proceed.
This Leviné is a young man, of about thirty or thirty-five, also Russian and a Jew. Pale, dirty, with drugged eyes, hoarse voice, vulgar, repulsive, with a face that is both intelligent and ugly."
This letter, which is about the only extant writing of Pius XII about the Jews of any length, is often cited as evidence of his anti-Semitism. Although it does not demonstrate overt hatred of Jews, it does suggest at least latent animosity and distrust of Jews and certainly that he harbored more than a few prejudices about Jews.
This shouldn't be regarded as the least bit surprising as none of these apparent attitudes and prejudices were unusual for the time, especially within the context of the Catholic Church. On the contrary, it would have been quite remarkable for Pacelli to have grown up and gone through so much Catholic education without having accepted the prevailing attitudes about Jews being revolutionaries, communists, opponents of Christian morality, sexually dangerous, etc.