Thomas Clarkson
From TLP
Thomas Clarkson (1760-1846) British abolitionist who encouraged the Amis des Noirs and supplied the society with propaganda that had been used in Britain. (James, p. 54)
References
James, C.L.R. (1989). The Black Jacobins. Toussaint L'Ouverture and the San Domingo Revolution. (2nd Ed., Revised) New York: Vintage Press. ISBN 0-679-72467-2.
http://www.brycchancarey.com/abolition/clarkson.htm