Internationaler Sozialistischer Kampfbund

The Internationaler Sozialistischer Kampfbund (German: [ɪntɐnatsjoˈnaːlɐ zotsjaˈlɪstɪʃɐ ˈkampfbʊnt], "International Socialist Militant League") or ISK was a socialist split-off from the SPD during the Weimar Republic and was active in the German Resistance against Nazism.

The Internationaler Sozialistischer Kampfbund (ISK) was a political organization founded by Göttingen philosopher Leonard Nelson and educator Minna Specht. Nelson and Specht had previously founded the International Socialist Youth League in 1917 and was supported by Albert Einstein. Nelson, a neo-Kantian hochschule teacher, had long wanted to teach at a university and also work politically. He advocated a brand of socialism that was ethically motivated, anti-clerical and anti-Marxist, but also undemocratic and included strict vegetarianism and a defense of animal rights. Nelson decided to establish the ISK after members of the ISYL were expelled from the Communist Party in 1922 and the Social Democratic Party in 1925.

The ISK took over the ISYL's publishing label, Öffentliches Leben, which published the ISK newsletter beginning January 1, 1926. Beginning January 1929, an edition in Esperanto was added, and in April, a small circulation quarterly in English was added as well. It was usually eight pages and editions ran an average of 5,000 to 6,000 copies. Nelson moved his main published works there as well, his philosophical and political series Öffentliches Leben and his 1904 treatises, "Abhandlungen der Fries’schen Schule, Neue Folge", re-reasoned with mathematician Gerhard Hessenberg and physiologist Karl Kaiser, and which, after Nelson's death, was continued by Nobel Prize winner Otto Meyerhof, sociologist Franz Oppenheimer and Minna Specht until 1937.

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