The Concordancia was a political alliance in Argentina. Three presidents belonging to it, Agustín P. Justo, Roberto Ortiz, and Ramón Castillo were in power from 1931 to 1943, a period known in Argentina as the "Infamous Decade".

Agustín Pedro Justo Rolón was an Argentine military officer, diplomat and politician, who served as the president of Argentina from 1932 to 1938 during the Infamous Decade. Justo took part in the coup of 1930, becoming president two years later thanks to widespread electoral fraud. His presidency was part of the period known as the Infamous Decade, which lasted from 1930 until 1943. He established the country's central bank and introduced a nationwide income tax.