convinced the government of Belgium to give them the space and funding for this project, arguing that it would help Belgium bolster its bid to house the League of Nations headquarters. They were given space in the left wing of the , a government building in Brussels. They then hired staff to help add to their Universal Bibliographic Repertory. In 1921 Otlet wrote to W. E. B. Du Bois offering the use of the Palais Mondial for the 2nd Pan-African Congress. Although both Otlet and Fontaine offered a warm welcome to the Congress, these sentiments were not shared across all of Belgian society. The Brussels-based paper Neptune stated that the organisers – particularly the National Association for the Advancement of Coloured People were funded by the Bolsheviks – and raised concern that it might lead to difficulties in the Belgian Congo by drawing together "all the ne’er-do-wells of the various tribes of the Colony, aside from some hundreds of labourers". The Palais Mondial was briefly shuttered in 1922, due to lack of support from the government of Prime Minister Georges Theunis, but was reopened after lobbying from Otlet and La Fontaine. Otlet renamed the Palais Mondial to the Mundaneum in 1924. The RBU steadily grew to 13 million index cards in 1927; by its final year, 1934, it had reached more than 15 million. Index cards were stored in custom-designed cabinets, and indexed according to the Universal Decimal Classification. The collection also grew to include files (including letters, reports, newspaper articles, etc.) and images, contained in separate rooms; the index cards were meant to catalog all of these as well. The Mundaneum eventually contained 100,000 files and millions of images. In 1934, the Belgian government again cut off funding for the project, and the offices were closed. (Otlet protested by keeping vigil outside the locked offices, but to no avail.) The collection remained untouched within those offices, however, until 1940, when Germany invaded Belgium. Requisitioning the Mundaneum's quarters to hold a collection of Third Reich art and destroying substantial amounts of its collections in the process, the Germans forced Otlet and his colleagues to find a new home for the Mundaneum. In a large but decrepit building in Leopold Park they reconstituted the Mundaneum as best as they could, and there it remained until it was forced to move again in 1972, well after Otlet's death. The World City The