Before revision: Thomas Paine upright=0.7|Thomas Paine Thomas Paine (1731–1809) further elaborated on natural rights in his influential work Rights of Man (1791), emphasizing that rights cannot be granted by any charter because this would legally imply they can also be revoked and under such circumstances, they would be reduced to privileges: Lysander Spooner upright=0.7|Lysander Spooner Spooner's writings include the abolitionist book The Unconstitutionality of Slavery and No Treason: The Constitution of No Authority, which opposed treason charges against secessionists.Smith, George H. (1992).
After revision: Thomas Paine upright=0.7|Thomas Paine Thomas Paine (1731–1809) further elaborated on natural rights in his influential work Rights of Man (1791), emphasizing that rights cannot be granted by any charter because this would legally imply they can also be revoked and under such circumstances, they would be reduced to privileges:  Spooner's writings include the abolitionist book The Unconstitutionality of Slavery and No Treason: The Constitution of No Authority, which opposed treason charges against secessionists.Smith, George H. (1992).