He served as the minister of grace and justice between 1934 and 1939 in the cabinet of Benito Mussolini.

He was among the pioneers in the establishment of international relations as an academic subject in Italy.

[2] In October 1925 Solmi joined the National Fascist Party led by Benito Mussolini.

[2][3] Solmi was one of the scholars who contributed to the establishment of the Institute for International Political Studies.

[1] The others were Carlo Emilio Ferri, Giuseppe Gallavresi and Giorgio Mortara.