Rerum Novarum: a call for justice -- Leo XIII and allegiance to the state -- Pius XI and a new social order -- The contribution of Pius XII -- Pope John Paull XXIII -- a new direction? -- Vatican II: another agenda -- Paul VI on the progress of peoples -- Medellín and Octogesima Adveniens -- Two synods and Pope Paul's response -- John Paul II: an integral humanism -- A new encyclical: poverty and solidarity -- An organic tradition?