Social Democratic Federation (US)
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The Social Democratic Federation was a political party in the United States. It was formed in 1936 by a group of anti-Trotskyists in the Socialist Party of America. They supported Democratic Party and Liberal Party candidates, but as the Socialist Party moved to the right, the SDF felt able to rejoin it, and did so in 1956 (with the exception of a small group which formed the Democratic Socialist Federation).