Socialist Democratic Union (Greek: Σοσιαλιστική Δημοκρατική Ένωση) was one of the many anti-dictatorial struggle groups that fought against the Greek military junta of 1967-1974. The Socialist Democratic Union organized and mobilized Greeks working and studying in Western Europe against the colonel's junta.

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Among the founders of the group was former President of the Hellenic Republic Karolos Papoulias.

• History of Modern Greece
• Greek military junta of 1967-1974

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