In that occasion the party, that was especially strong in Southern Italy, gained 10.9% of the vote and 60 seats in the Chamber of Deputies.

[1] In January 1922 the "National Council of Social Democracy and Radicalism" was officially created; this event is considered the date of the party's official formation and of the dissolution of the Italian Radical Party.

The main party's founders were Giovanni Antonio Colonna di Cesarò, Arturo Labriola and Ettore Sacchi.

After the March on Rome, the party took part to the governments of Benito Mussolini until July 1924.

It gained only 1.6% of votes in the general election of the same year and Antonio Colonna di Cesarò took part to the Aventine Secession.