The Argentine Revolution of 1905 also known as the Radical Revolution of 1905 was a civil-military uprising organized by the Radical Civic Union and headed by Hipólito Yrigoyen against the oligarchic

Leandro Nicéforo Alem was an Argentine politician, founder and leader of the Radical Civic Union. He was the uncle and political mentor of Hipólito Yrigoyen. Alem was also an active Freemason.