A discourse upon extortion : wherein is shewn, I. What extortion is. II. How extortion is practiced. III. That enslaving of fellow-creatures is the worst kind of extortion. IV. That by enslaving the Negroes, the American states are become guilty of the worst kind of extortion. V. What the will of Christ is concerning extortioners in the church. VI. An address to the Honorable American Congress. VII. An address to the rulers of America, both legislative and executive. VIII. An address to the ministers of Christ in America. IX. An address to the people of America. X. An address to the Negro slaves in America. /