Doyle ya kasance mai goyon bayan yakin neman sake fasalin jihar Congo Free State, wanda dan jarida ED Morel da jami'in diflomasiyya Roger Casement suka jagoranta. A lokacin 1909 ya rubuta The Crime of the Congo, wani dogon ɗan littafin da ya yi tir da abubuwan ban tsoro na wannan mulkin mallaka. Ya zama sananne tare da Morel da Casement, kuma yana yiwuwa cewa, tare da Bertram Fletcher Robinson, sun yi wahayi zuwa ga wasu haruffa a cikin littafin 1912 The Lost World. Doyle ya rabu da Robinson lokacin da ya zama ɗaya daga cikin shugabannin ƙungiyar pacifist na Easter a lokacin yakin duniya na farko.
Sarauniya