Roque Sáenz Peña

He was responsible for passing Law 8871, known as "Sáenz-Peña Law", which greatly reformed the Argentine electoral system, making the vote secret, universal and compulsory for males over 18. This effectively ended the rule by electoral fraud of the conservative Argentine oligarchy, the Generation of '80, and paved the way for the rise of the Radical Civic Union in the first free elections of the country. Provided by Wikipedia