Similar to Adolf Hitler, Italian Fascist leader Benito Mussolini did not become the dictator of a totalitarian regime overnight. For several years, he and his allies worked more or less within the confines of the Italian constitution to accrue power, eroding democratic institutions until the moment came for them to be done away with entirely. It is generally agreed that that moment came in speech Mussolini gave to the Italian parliament on January 3, 1925, in which he asserted his right to supreme power and effectively became the dictator of Italy.
Mussolini had been a schoolteacher and an avowed socialist, but after World War I he became a leader of the nascent Fascist movement. Like much of Europe, Italy was rife with social turmoil in the wake of the war, with paramilitary groups and street gangs frequently clashing over their competing visions for the new political order. A close confidant of Mussolini formed a Fascist paramilitary group, known as the Blackshirts or squadristi, as Mussolini led the political party, and they found that government fears of a communist revolution allowed them to operate without state intervention. By 1921, Mussolini had been elected to parliament as the leader of the growing National Fascist Party.
Soon after Mussolini's election, armed Blackshirts marched on Rome, demanding that the king install Mussolini as Prime Minister. In a decision that utterly changed the course of Italian and European history, King Victor Emmanuel III ignored Prime Minister Luigi Facta's pleas that he declare martial law, leading to Facta's resignation and Emmanuel's invitation to Mussolini to form a new government. The Fascists and their moderate allies set about dismantling Italy's democratic institutions. He was proclaimed dictator for a year and increasingly merged his party and its paramilitary wing with the state and the official military. He also undertook a program of privatizations and anti-union legislation in order to assure industrialists and aristocrats that fascism would protect them from socialism.
Despite these reforms, many Fascists felt Mussolini was moving too slowly. In 1924, assassins with ties to Mussolini killed socialist leader Giacomo Matteotti, leading most of the parliamentary opposition to boycott Mussolini's legislature. The Fascists felt that their moment had come. On December 31, they issued an ultimatum to Mussolini. Three days later, he addressed the remainder of parliament, declaring "I, and I alone, assume the political, moral, and historical responsibility for all that has happened," obliquely referring to the assassination of Matteotti. In doing so, Mussolini dared prosecutors and the rest of Italy's democratic institutions, as well as the king, to challenge his authority. None did. Thus, from 1925 onward, Mussolini was able to operate openly as a dictator, styling himself Il Duce and fusing the state and the Fascist Party. Two decades of suppression and brutality followed, culminating in Mussolini's alliance with Nazi Germany and the Second World War.
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