Let me Google that for you:

"World War I and its aftermath (1914–1929)

At the outbreak of World War I in August 1914, the Italian political left became severely split over its position on the war. The Italian Socialist Party (PSI) opposed the war but a number of Italian revolutionary syndicalists supported war against Germany and Austria-Hungary on the grounds that their reactionary regimes had to be defeated to ensure the success of socialism.[112] Angelo Oliviero Olivetti formed a pro-interventionist fascio called the Revolutionary Fasces of International Action in October 1914.[112] Benito Mussolini upon being expelled from his position as chief editor of the PSI's newspaper Avanti! for his anti-German stance, joined the interventionist cause in a separate fascio.[113] The term "Fascism" was first used in 1915 by members of Mussolini's movement, the Fasces of Revolutionary Action.[114]

The first meeting of the Fasces of Revolutionary Action was held on 24 January 1915[115] when Mussolini declared that it was necessary for Europe to resolve its national problems—including national borders—of Italy and elsewhere "for the ideals of justice and liberty for which oppressed peoples must acquire the right to belong to those national communities from which they descended".[115] Attempts to hold mass meetings were ineffective and the organization was regularly harassed by government authorities and socialists.[116] German soldiers parading through Lübeck in the days leading up to World War I. Johann Plenge's concept of the "Spirit of 1914" identified the outbreak of war as a moment that forged nationalistic German solidarity.

Similar political ideas arose in Germany after the outbreak of the war. German sociologist Johann Plenge spoke of the rise of a "National Socialism" in Germany within what he termed the "ideas of 1914" that were a declaration of war against the "ideas of 1789" (the French Revolution).[117] According to Plenge, the "ideas of 1789"—such as the rights of man, democracy, individualism and liberalism—were being rejected in favor of "the ideas of 1914" that included "German values" of duty, discipline, law and order.[117] Plenge believed that racial solidarity (Volksgemeinschaft) would replace class division and that "racial comrades" would unite to create a socialist society in the struggle of "proletarian" Germany against "capitalist" Britain.[117] He believed that the "Spirit of 1914" manifested itself in the concept of the "People's League of National Socialism".[118] This National Socialism was a form of state socialism that rejected the "idea of boundless freedom" and promoted an economy that would serve the whole of Germany under the leadership of the state.[118] This National Socialism was opposed to capitalism because of the components that were against "the national interest" of Germany, but insisted that National Socialism would strive for greater efficiency in the economy.[118][119] Plenge advocated an authoritarian rational ruling elite to develop National Socialism through a hierarchical technocratic state.[120] "

https://en.wikipedia.org/wiki/Fascism