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Guinn v. United States, 238 U.S. 347 (1915), properly Frank Guinn and J. J. Beal v. United States, was an important United States Supreme Court decision that dealt with Jim Crow laws, which helped enforce segregation in the United States between 1865 and 1964.
Argued before the Court on October 17 1913.
Handed down on June 21 1915, in the decision the Court ruled that an Oklahoma law that denied the right to vote to some citizens was unconstitutional.
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