 After the Lateran Treaty settled the "Roman Question" and made the Vatican an independent state, di Jorio was chosen by Nogara to run the Vatican Bank, and aided by laws that allowed Nogara to freely buy shares in any company even if it made products contrary to Catholic Church teaching, the Vatican grew immensely wealthy, buying extensively into such wealthy corporations as General Motors, Standard Oil, General Electric and IBM – as well as Italgas, the major supplier of gas in Italy at the time.Father di Jorio (later a Monsignor) continued to run the "Istituto per le Opere di Religione" (and did so until after Vatican II) but he also played many other roles in the Curia during these years, most notably becoming Secretary of the Sacred College of Cardinals in 1947.He was secretary of the conclave during the election of Pope John XXIII, who put his zuchetto on di Jorio's head at the end of the conclave, a traditional promise that he would make di Jorio a cardinal.