Ledóchowski accurately surmised Hitler's perfidious nature, and predicted the Hitler-Stalin Pact, and used the Jesuit-run Vatican Radio service to broadcast condemnations of Nazi crimes in Poland, which led to German government protests, and assisted underground resistance movements in occupied Europe. The Nazi persecution of the Catholic Church in Poland was particularly severe, and Lapomarda writes that Ledóchowski helped "stiffen the general attitude of the Jesuits against the Nazis", and helped Vatican Radio, run by the Jesuit Filippo Soccorsi, and spoke out against Nazi oppression - particularly with regard to Poland - and against Vichy-French anti-Semitism.