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). History Origins of split Social Democratic Federation leader Louis Waldman noted in his memoirs that while the official split of the Socialist Party that resulted in the creation of the Social Democratic Federation took place in 1936, "the crucial events occurred at the party's national convention in Detroit in 1934." It was at this national gathering that the ongoing factional war between a youthful "Militant" faction favoring aggressive advocacy of revolutionary tactics and joint action with the Communist Party won the day and pushed through a new Declaration of Principles, leading the SPA's right wing faction, known as the "Old Guard" to abandon the organization. Throughout the 1930s the Socialist Party had achieved moderate growth, its paid membership returning to the 25,000 level and its candidate for President of the United States Norman Thomas polling nearly a million votes in the election of 1932. Waldman recounted the main points of departure between the radical youth of the party and the staid older elements: It all began with the formation of groups in the Socialist Party that wanted to commit it to direct action. "Direct action" means that an organized group will take any action, illegal as well as legal, that it believes will bring about the reform, changes, or objective it seeks. The general strike for political purposes, sabotage, the use of violence, the spread of fear, the paralysis of industry, trade, commerce, and even government are examples... The direct-action groups in the Socialist Party called themselves Militants; some formed the Revolutionary Policy Committee; others used other names. When they first appeared on the scene, they wore blue shirts and adopted the upraised arm and the clenched fist as a form of salute. They insisted that the party coin flamboyant slogans, organize street demonstrations, arrange great protest rallies, and in general, do the things that the Communists had made popular in their day-to-day activities. The Militants also proposed that, as the Communists had done, we form separate organizations for the unemployed, youth, tenants, and housewives, as if those groups had interests distinct from those of the workers