The Federation of the Democratic and Socialist Left (Fédération de la gauche démocrate et socialiste or FGDS) was a conglomerate of French left-wing non-Communist forces. It was founded to support François Mitterrand's candidature at the 1965 presidential election and to counterbalance the Communist preponderance over the French left.

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Federation of the Democratic and Socialist Left
Abbreviation	FGDS
Leader	François Mitterrand
Founded	1965
Dissolved	1969
Succeeded by	Socialist Party
Ideology	Socialism Factions: Democratic socialism Radicalism Social liberalism Republicanism
Political position	Centre-left to left-wing[1]
Politics of France Political parties Elections

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It was composed of:

• the SFIO Socialist party led by Guy Mollet
• the Radical Party headed by René Billères
• the Convention of Republican Institutions (CIR) of François Mitterrand
• the Union of Socialist Groups and Clubs (UGCS) of Jean Poperen
• the Union of Clubs for the Renewal of the Left of Alain Savary

Before the beginning of the 1965 presidential campaign, the non-Communist left was divided. The Socialist Gaston Defferre proposed the creation of a "Great Federation" gathering the center-left and the center-right parties in order to resist to the Gaullist domination over the country and to the leading role of the French Communist Party (PCF) over the opposition. He wanted to be its candidate for the presidency. However, this project failed in due to the objections of the Socialist and Christian-Democrat leaders.

François Mitterrand then proposed to be candidate with a strategy of union between the left-wing forces, including the PCF. This one accepted to support his candidature. Nevertheless, in order to talk on an equal footing with the Communists, he advocated the constitution of a federation of the left-wing non-Communist forces. This strategy was confirmed by the relatively good electoral result of Mitterrand, who succeeded to prevent a re-election of De Gaulle in the first round, and obtained 45% of the votes against him in the second round. Furthermore, the PCF/FGDS electoral agreements permitted to shrink the Gaullist parliamentary majority after the 1967 legislative election. But the FGDS was divided about question of the relations with the PCF which demanded the elaboration of a common platform.

During the May 68 events, François Mitterrand announced his candidature for an anticipated presidential election. He thought Charles de Gaulle would resign after the crisis. Finally, de Gaulle dissolved the National Assembly and his followers won the June 1968 legislative election. Held as responsible for the failure, Mitterrand resigned in November 1968 and the FGDS dissolved itself. Mitterrand then undertook to conquer the Socialist Party (PS) which succeeded to the SFIO in 1969.