The German lawyer / labour law professor Hugo Sinzheimer (1875-1945) has, in the first two decades of the twentieth century, contributed significantly to the legal recognition of the ‘collective labour agreement’. The imperative character of CLA provisions, now widely accepted all over the world, required a paradigmatic turn in the dominant private law perspective on labour relations. The paper tries to specify what made him able and prone to do this, both by reconstructing the legal and political discussion in Germany and the Netherlands and by relating elements of the process to social-scientific theories of institutional and intellectual innovation. I argue that his combination of commitments in various fields (legal practice, science, politics) allowed him to span the gap between the fields of labour relations and state law and to contribute to the constitutionalisation of labour relations.

The article deals with an unknown chapter of the history of Muslims in the Netherlands in the interwar period. It follows the public debate about the construction of the first mosque in The Hague before the Second World War. The first initiative was made in 1929 by the Dutch convert to Islam Mohammed Ali van Beetem, who played a leading role among the Indonesian Muslim community in the Netherlands. After more than two decennia of debate and negotiations with the municipal authorities in The Hague, the first mosque was finally built by the Ahmadiyya-mission in 1955.

This article discusses David van Reybrouck’s history of Congo. The focus is on violence and there is special attention for the period of the Congo Free State, 1885-1908, under king Leopold. A comparison is made between Van Reybrouck’s views and those of Adam Hochchild. It is concluded that the former passes a milder judgment on the actions of Leopold’s troops than the latter, while he also presents a more diversified account. Both authors, however, reject the label of genocide for Leopold’s ‘rubber terror’. The article concludes with some reflections on the concept of genocide, proposing to replace it with organized murder.