The essay analyzes the Catholic Church's attitude toward the Jews during the Thirties, examining the diocesan press of the North-East of Italy. Going through the Catholic weekly newspapers it was first possible to establish their position with respect to the spread of racist and anti-semitic ideologies, and then to outline which were the images of Jews theorized and propagandized by the Catholic press. The old teaching of the Catholic doctrine and theology concerning the Jews influenced the construction of the collective imaginary and the creation of anti-semitic stereotypes from the second half of the XIX century.