The RGR was largely composed of the Radical-Socialist Party, which had governed France during most of the Third Republic, and of the Democratic and Socialist Union of the Resistance (Union démocratique et socialiste de la Résistance), which included René Pleven and François Mitterrand.
The RGR was a political coalition in France that was largely composed of the Radical-Socialist Party, who had governed France during most of the Third Republic, along with the Democratic and Socialist Union of the Resistance (Union démocratique et socialiste de la Résistance), which included René Pleven and François Mitterrand.