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In page Society for Effecting the Abolition of the Slave Trade:

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From 1823, the Society for the Mitigation and Gradual Abolition of Slavery Throughout the British Dominions (also known as the Anti-Slavery Society) became the primary organised group working for legislation to abolish slavery. The Society and supporters, including captive and freed Africans, missionaries and evangelical movements in the colonies, worked to achieve the first stage of legal emancipation in the colonies. It also supported abolitionists in the United States. Many British supported lecture tours by American abolitionists in Britain who were raising funds for efforts in the United States. Such supporters sometimes provided refuge to Americans who had escaped from slavery and helped raise money to buy their freedom, as for Frederick Douglass.[citation needed]