 He represented the party in the Peace Movement, replacing Charles Tillon, who stepped down in 1952 (in connection with his association with André Marty).At the PCF, he was responsible for relations with intellectuals and with youth.After the revelations of the Twentieth Congress of the Soviet Communist Party, during which Nikita Khrushchev denounced the "cult of personality" surrounding Joseph Stalin, Casanova became a Soviet representative to the governing bodies of PCF, a reaction favorable to Casanova based on a liberalizing change of style and thought in Russia.