On this day in Germany, 1946 (Hitler, the SPD and the German Democrats)

[sahel]

16. They advocated for the nationalisation of major industries

and certainly had socialist objectives in their platform.

Otto Wels, the SPD leader, used the terms interchangeably in his speech against the Enabling Act:-

The Weimar Constitution is not a socialist constitution. But we stand by the principles enshrined in, the principles of a state based on the rule of law, of equal rights, of social justice. In this historic hour, we German Social Democrats solemnly pledge ourselves to the principles of humanity and justice, of freedom and socialism. No Enabling Act gives you the power to destroy ideas that are eternal and indestructible. After all, you yourselves have professed your adherence to Socialism. The Socialist Law has not destroyed social democracy. German social democracy will draw new strength also from the latest persecutions.

The point being that the Nationalist Socialist party was not socialist, despite its title, but the Social Democratic Party, despite its title, was.