He became involved in the anti-slavery movement in the 1820s, and over time he rejected both the American Colonization Society and the gradualist views of most others involved in the movement. Garrison co-founded The Liberator to espouse his abolitionist views, and in 1832 he organized the New-England Anti-Slavery Society. This society expanded into the American Anti-Slavery Society, which espoused the position that slavery should be immediately abolished.