Social Democratic Federation (United States)

The Social Democratic Federation of the United States of America (SDF) was a political party in the United States, formed in 1936 by the so-called "Old Guard" faction of the Socialist Party of America. The SDF later merged again with the Socialist Party in 1957 to form the Socialist Party-Social Democratic Federation (SP-SDF).[1]

Social Democratic Federation dues stamps were applied continuously to regular SPA dues booklets in 1936 & 1937.

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