Until World War II, Radicals were a strong political force in France, embodied by the Republican, Radical and Radical-Socialist Party which was the most important party of the Third Republic. Since World War II, they were marginalized while French politics became characterized by two politically opposed groupings: one left-wing, centred on the French Section of the Workers' International and its successor the Socialist Party (since 1969); and the other right-wing, centred on the Gaullist Party, whose name changed over time to the Rally of the French People (1947), the Union of Democrats for the Republic (1958), the Rally for the Republic (1976), the Union for a Popular Movement (2007) and The Republicans (since 2015). In the 2017 presidential and legislative elections, radical centrist party En Marche! became the dominant force, overtaking both Socialists and Republicans.