As the main activist arm of the Abolition Movement (see abolitionism), the society was founded in 1833 under the leadership of William Lloyd Garrison. By 1840 its auxiliary societies numbered 2,000, with a total membership ranging from 150,000 to 200,000. The societies sponsored meetings, adopted resolutions, signed antislavery petitions to be sent to Congress, published journals and enlisted subscriptions, printed and distributed propaganda in vast quantities, and sent out agents and lecturers (70 in 1836 alone) to carry the antislavery message to Northern audiences.
