Conventionally, the starting point of socialist and communist resistance to fascism in Europe and the creation of a European ‘culture of anti-fascism’ is dated to the 1930s in the context of the establishment of the Third Reich in 1933 and the outbreak of the Spanish Civil War in 1936. The hypothesis of the article is that the initiatives and debates of 1923 played a pivotal role in the creation of the transnational anti-fascist movement that transferred cultures of anti-fascism across borders in Europe and the world. The aim of the article is to analyse the first, but hitherto forgotten, efforts to make anti-fascism a transnational phenomenon in the early 1920s. Further, the article will discuss whether there are clear continuities or discontinuities in the anti-fascist articulations of 1923 and the ones created after 1933.