 On 24 April 1931, he was appointed Undersecretary of the Sacred Congregation of Seminaries and Universities.Monsignor Roberti was made Auditor of the Roman Rota on 5 June 1936, and served as Dean of the Pontifical Institute of Canon and Civil Law from 1937 to 1943.He was named Secretary of the Sacred Congregation of the Council on 9 March 1946; as such, he was the second-highest official of that dicastery, successively under Cardinals Francesco Marmaggi, Giuseppe Bruno, and Pietro Ciriaci.