Conversation so far:
What were George Bernard Shaw's first political activities?
On 5 September 1882 George Bernard Shaw attended a meeting at the Memorial Hall, Farringdon, addressed by the political economist Henry George.
Was George Bernard Shaw an active member?
George Bernard Shaw was not impressed by the SDF's founder, H. M. Hyndman, whom he found autocratic

Question: Is there any additional information about his time with the SDF?
Self-contained rewrite: Is there any additional information about George Bernard Shaw's time with the SDF?