 By 1848 when evangelical bishop John Bird Sumner became Archbishop of Canterbury, it is said that between a quarter and a third of Anglican clergy were linked to the movement, which by then had diversified greatly in its goals, although they were no longer considered an organised faction.Other societies that members of the group founded or were involved with included the Anti-Slavery Society, the Abolition Society, the Proclamation Society, the Sunday School Society, the Bettering Society, and the Small Debt Society.The Clapham Sect have been credited with playing a significant part in the development of Victorian morality, through their writings, their societies, their influence in Parliament, and their example in philanthropy and moral campaigns, especially against slavery.