Who among the following was a proponent of Fabianism as a movement?

The Fabian Society is a British socialist intellectual movement best known for its initial ground-breaking work beginning in the late 19^th century and then up to World War I. Fabianism focussed on the advancement of socialist ideas through gradual influence and patiently insinuating socialist ideology into intellectual circles and groups with power. Annie Besant was a leading speaker for the Fabian Society and the Marxist Social Democratic Federation.