Doyle aiva mutsigiri mushandirapamwe wokugadziridzwa kweCongo Free State, inotungamirirwa nemutori wenhau E. D. Morel uye mumiriri Roger Casement. Muna 1909 akanyora The Crime of the Congo, kabhuku kadiki kaakanyora nezvekuvhunduka kwekoloni iyoyo. Akasangana naMorel naCasement, uye zvinokwanisika kuti, pamwe naBertram Fletcher Robinson, vakafuridzira mavara akati wandei munoverengeka ya1912 The Lost World. Doyle akaputsa naRobinson paakava mumwe wevatungamiriri ve pacifist Easter Movement panguva yeHondo Yenyika Yekutanga.
Bertram Fletcher Robinson