On 17 October 1945, tens of thousands of workers mobilized in Buenos Aires to demand the release and reinstatement of Juan Domingo Perón. The demonstration became a defining moment in the rise of Peronism. Crowds gathered at Plaza de Mayo and pressured the government to restore Perón to his positions of power. The event marked a major shift in Argentina’s political landscape. It is commemorated annually as Loyalty Day. The date symbolizes the connection between Perón and the working class.