Salmon Portland Chase (January 13, 1808 – May 7, 1873) was an American politician and jurist who served as U.S. Senator from Ohio and the 23rd Governor of Ohio; as U.S. Treasury Secretary under President Abraham Lincoln; and as the sixth Chief Justice of the United States Supreme Court.
Chase was one of the most prominent members of the new Republican Party before becoming Chief Justice. Chase articulated the "Slave Power conspiracy" thesis well before Lincoln. He coined the slogan of the Free Soil Party, "Free Soil, Free Labor, Free Men." He devoted his energies to the destruction of what he considered the Slave Power – the conspiracy of Southern slave owners to seize control of the federal government and block the progress of liberty.