Otto Wels, Paul Hertz, Friedrich Stampfer, Erich Ollenhauer, and others were assigned to build up a foreign party structure in Prague.
The Sopade broke with the remaining party executive committee in Berlin in mid-May 1933, two weeks after Paul Löbe agreed to Hitler's peace resolution, which was interpreted as the SPD sanctioning fascist foreign policy.
Under pressure from the intra-party opposition groups Neu Beginnen and Revolutionäre Sozialisten Deutschlands, in 1934 the Sopade published the Prague Manifesto, penned by Rudolf Hilferding.
The Reports were published by order of the executive committee in exile of the SPD, edited by Erich Rinner, until March 1938 in Prague, from May 1938 in Paris.
In 1945, the Allied occupants in the Western zones initially allowed four parties to be established, including the re-establishment of the SPD.