Social Democratic Federation (United States)
| Social Democratic Federation | |
|---|---|
| Founded | 1936 | 
| Dissolved | 1956 | 
| Preceded by | CPSP | 
| Merged into | SPA (majority) | 
| Succeeded by | DSF (minority) | 
| Ideology | Social democracy | 
| Political position | Left-wing | 
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).