The Party of Democratic Socialism (Czech: Strana demokratického socialismu; SDS) was a democratic socialist[citation needed] political party in the Czech Republic.

It's the political unification of SDL (Party of the Democratic Left) and LB (Left Block) that took place in June 1997.

During 2017 Czech legislative election and many previous elections, members of the party ran on the Communist Party of Bohemia and Moravia's ballot.

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