Italian Social Democratic Party (PDSI)

Founded: 1919 (legally recognised from 26 April 1922)

Banned: 6 November 1926

Founders: Ettore Sacchi, Giovanni Antonio Colonna di Cesaro (from an Italian noble family) and Arturo Labriola. 

Major beliefs: Social liberalism & Radicalism. Labriola was part of the Labour movement.

Party development until 1922: In January 1922, the “National Council of Social Democracy and Radicalism” was officially created with the merging of the Constitutional Democratic Party, the Radical Party and the Democratic Party.

Impact on the political development of Italy: