In this contribution we will focus upon the development of transnational intellectual networks at the eve of the First World War. Several institutions were founded with the aim to stimulate and facilitate transnational intellectual cooperation. We will elaborate the case of Dokumente des Forschritts/Documents du progrès/Progress (1907-1916) a journal which appeared simultaneously in three languages. Contributors to this laboratory of progressive thought, include leading social scientists (Emile Durkheim, …), socialists (e.g. Jean Jaurès, Emile Vandervelde,…), feminists (Adèle Schreiber, ...) educational and other social reformers (among them Ellen Key) and artists and writers (Bertha von Suttner, Emile Verhaeren, .. ). The journal’s patronizing organisation (Instititut Internationale pour la Diffusion des Expériences Sociales) established a world-wide network of member organisations, interconnecting a wide range of social movements, and organized lectures on pacifism and social reform throughout Europe and occasionally in the United States. We will argue that not only this journal but also the lectures resulted in durable networks of (female) intellectuals.