Born in San Miguel de Tucumán, Gallo joined the Radical Civic Union (UCR) from its inception, forming part of a group of young people who worked with Hipólito Yrigoyen in the mid-1890s to secure universal male suffrage. Following the passage of the Sáenz Peña Law to that effect, he was elected to Congress in 1912 on the UCR ticket, and to the Senate (1919-1923), always representing the city of Buenos Aires.
In 1920, Gallo was one of the founding members of the Argentine Patriotic League, a right-wing paramilitary organization. President Marcelo Torcuato de Alvear named Gallo Minister of Internal Affairs in 1923, and in 1924, he was part of a group of UCR members who broke with their logtime leader, the populist Yrigoyen, and formed the splinter Antipersonalist UCR. He resigned in 1926 when Alvear declined to support his proposal for a federal intervention in Buenos Aires Province, where a moderate UCR figure, Valentín Vergara, had been elected governor.
Supported by conservatives since his attempted removal of Governor Vergara, he was the Anti-Personalist UCR candidate for Vice-President, as running mate to Leopoldo Melo, in the 1928 elections. Yrigoyen defeated their ticket in a landslide, however.
Between 1934 and 1941 Gallo was Dean of the University of Buenos Aires, where he was a professor in Administrative Law. He was married to Celia Gallo, the daughter of his uncle, politician Delfín Gallo.
- Una propuesta nacionalista frente a la conflictividad social de la década de 1920: la Liga Patriótica Argentina, por Mirta Moscatelli
- Walter, Richard. The Province of Buenos Aires and Argentine Politics. 1912-1943. Cambridge University Press, 1985.
- Luna, Felix (2004). El antipersonalismo (in Spanish) (Anales 2004 ed.). Buenos Aires, Argentina: Academia Nacional de Ciencias Morales y políticas. .
- Luna, Felix (1964). Yrigoyen (in Spanish) (Anales 2004 ed.). Buenos Aires, Argentina: Desarrollo.
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