Léon de Poncins’ Judaism and the Vatican: An Attempt at Spiritual Subversion argues that the 1964 Declaration on the Jews (leading to Nostra Aetate) was a result of Jewish pressure designed to alter traditional Catholic doctrine regarding deicide. It details the internal battles of Vatican II, opposing efforts to soften charges against Jews. The work presents a traditionalist, anti-liberal perspective on the changes within the Catholic Church, focusing on Jewish influence on the doctrinal shift.