有些廢奴主義者，例如洛夫喬伊，曾經參加1833年的「反奴隸制度宣言大會」 (Declaration of the  Anti-Slavery Convention)

出處: Merrihew & Gunn, printers. "Declaration of the Anti-Slavery Convention. Assembled in Philadelphia, December 4, 1833." Broadside. Philadelphia, 1833, An American Time Capsule: Three Centuries of Broadsides and Other Printed Ephemera, Library of Congress.