Angus Mitchell at The Dublin Review of Books:
As the nineteenth century came to an end, rumours started to circulate widely about the violence perpetrated by the regime of King Leopold II in the Congo Free State. Parliamentary intervention followed from involvement by the two main NGOs: the British and Foreign Anti-Slavery Society and the Aborigines Protection Society. In 1903, a question was asked in the House of Commons by the Liberal MP Herbert Samuel. The foreign secretary, Lord Lansdowne, ordered the British consul and his man on the spot, Roger Casement, to journey into the upper Congo. Having spent five years reporting officially on many aspects of Leopold’s colonial administration, Casement was well-placed to investigate the stories. He would spend the next three months travelling through the region. On exiting the river with a dossier of hand-written reports, copied correspondences and memos, testimonies and a diary, he scribbled the first of nearly three hundred letters to ED Morel, a young activist-writer. He recommended him to read Heart of Darkness and suggested he contact the author, Joseph Conrad, to see if he would support a public campaign for systemic reform. Casement and Conrad had met in the lower Congo in 1890 and a friendship had developed between the two men.
more here.