Mussolini was a lifelong Socialist intellectual.
Mussolini earned his nickname "Il Duce" (the leader) from Italian Sociaist leader Olindo Vernocchi who declared "From todayyou, Benito, are not only the representative of the Romangna Socialists but the Duce of all revolutionary socialists in Italy" [Ivone Kirkpatrick, Mussolini (London:Odhams, 1964) pg 47]
He became editor of the Italian Socialist journal "Avanti" (Forward) in 1912.
He launched the journal "Utopia" named in honor of Thomas More whom Mussolini considered to be the first Socialist.
He was the leader of the Italian Socialist Party (PSI) and member of that party for 13 years.
The origin of the Nazi Party was a small group originally called the "Committee of Independent Workmen", founded by locksmith Anton Drexler in 1918. A year later in January 1919, Drexler's group merged with another group, the "Political Workers' Circle" to form a new party known as the "German Workers' Party" (Deutsche Arbeiterpartei or DAP).
Adolf Hitler joined the DAP in September 1919 and was put in charge of propaganda in 1920. Hitler transformed this small group into what we now know as the Nazi Party through his great skill in politics and public speaking. In April 1920, the words "National Socialist" were added to the party name and it became the "National Socialist German Workers Party" (Nationalsozialistische Deutsche Arbeiterpartei or NSDAP). [McNab, Chris (2009). The Third Reich]
"It is thus necessary that the individual should finally come to realize that his own ego is of no importance in comparison with the existence of his nation; that the position of the individual ego is conditioned solely by the interests of the nation as a whole...that above all the unity of a nation's spirit and will are worth far more than the freedom of the spirit and will of an individual....This state of mind, which subordinates
the interests of the ego to the conservation of the community, is really the first premise for every truly human culture....The basic attitude form which such activity arises, we call -- to distinguish it from egoism and selfishness -- idealism. By this we understand only the individual's capacity to make sacrifices for the community, for his fellow men."
(Adolf Hitler speaking at Bueckeburg, Oct. 7, 1933; The Speeches of Adolf Hitler, 1922-39, ed. N.H. Baynes (2 vols., Oxford, 1942), I, 871-72
"Private property" as conceived under liberalistic economic order was a reversal of the true concept of property. This "private proprerty" represented the right of the individual to manage and to speculate with inherited or acquired property as he pleased, without regard to the general interests...German socialism had to overcome this "private", that is, unrestrained and irresponsible view of property. All property is common property.
The owner is bound by the people and the Reich to the responsible management of his goods. His legal position is only justified when he satisfies this responsibility to the community.
(Ernst Huber, Nazi party spokesman; National Socialism, prepared by Raymond E. Murphy, et al; quoting Huber, Verfassungsrecht des grossdeutschen Reiches (Hamburg, 1939))
To be a socialist is to submit the I to the thou; socialism is sacrificing the individual to the whole.
(Nazi head of propaganda, Joseph Goebbels; In Erich Fromm, Escape from Freedom (New York: Farrar, 1941), pg. 233.)
I have learned a great deal from Marxism, as I do not hesitate to admit. The difference between them and myself is that I have really put into practice what these peddlers and penpushers have timidly begun...I had only to develop logically what Social Democracy repeatedly failed in because of its attempt to realize its evolution within the framework of democracy. National Socialism is what Marxism might have been if it could have broken its absurd and artificial ties with the democratic order.
(Hitler to Rauschning, The Voice of Destruction, pg. 186).