Benito Mussolini, an Italian World War I veteran and publisher of Socialist newspapers, breaks with the Italian Socialists and establishes the nationalist Fasci di Combattimento, named after the Italian peasant revolutionaries, or "Fighting Bands," from the 19th century. Commonly known as the Fascist Party, Mussolini's new right-wing organization advocated Italian nationalism, had black shirts for uniforms, and launched a program of terrorism and intimidation against its leftist opponents.
In October 1922, Mussolini led the Fascists on a march on Rome, and King Emmanuel III, who had little faith in Italy's parliamentary government, asked Mussolini to form a new government. Initially, Mussolini, who was appointed prime minister at the head of a three-member Fascist cabinet, cooperated with the Italian parliament, but aided by his brutal police organization he soon became the effective dictator of Italy. In 1924, a Socialist backlash was suppressed, and in January 1925 a Fascist state was officially proclaimed, with Mussolini as Il Duce, or "The Leader."
Mussolini appealed to Italy's former Western allies for new treaties, but his brutal 1935 invasion of Ethiopia ended all hope of alliance with the Western democracies. In 1936, Mussolini joined Nazi leader Adolf Hitler in his support of Francisco Franco's Nationalist forces in the Spanish Civil War, prompting the signing of a treaty of cooperation in foreign policy between Italy and Nazi Germany in 1937. Although Adolf Hitler's Nazi revolution was modeled after the rise of Mussolini and the Italian Fascist Party, Fascist Italy and Il Duce proved overwhelmingly the weaker partner in the Berlin-Rome Axis during World War II.
In July 1943, the failure of the Italian war effort and the imminent invasion of the Italian mainland by the Allies led to a rebellion within the Fascist Party. Two days after the fall of Palermo on July 24, the Fascist Grand Council rejected the policy dictated by Hitler through Mussolini, and on July 25 Il Duce was arrested. Fascist Marshal Pietro Badoglio took over the reins of the Italian government, and in September Italy surrendered unconditionally to the Allies. Eight days later, German commandos freed Mussolini from his prison in the Abruzzi Mountains, and he was later made the puppet leader of German-controlled northern Italy. With the collapse of Nazi Germany in April 1945, Mussolini was captured by Italian partisans and on April 29 was executed by firing squad with his mistress, Clara Petacci, after a brief court-martial. Their bodies, brought to Milan, were hanged by the feet in a public square for all the world to see.