As in the rest of the country, Peronist groups emerged in 1955 following the coup that removed Juan Perón from office. These Peronist groups, together with other socialist and anarchist groups, began opposing Argentina's third military dictatorship that began in 1966. Worker and student participation in politics grew due to the widespread discontent with the appointed governor's hard-line stance, culminating in the violent May, 1969, popular revolt known as the "Cordobazo". This revolt, mirrored by the "Rosariazo" and others in several parts of the country, undermined the power of dictator Juan Carlos Onganía and ultimately led to his ouster by more moderate military factions.