Who was the Chief Justice behind the Supreme Court decision where Robert Cooper Grier served as a juror, which denied a "negro" could an American citizenship?
Robert Cooper Grier:  As a rare Northern member of the majority in the infamous 1857 Dred Scott decision, Grier concurred that African Americans were not—and were never meant to be—citizens of the United States and that the property rights of slaveholders were clearly protected in the Constitution. Dred Scott v. Sandford:  It held that "a negro, whose ancestors were imported into [the U.S.], and sold as slaves", whether enslaved or free, could not be an American citizen and therefore had no standing to sue in federal court, and that the federal government had no power to regulate slavery in the federal territories acquired after the creation of the United States. Dred Scott v. Sandford:  In a 7–2 decision written by Chief Justice Roger B. Taney, the court denied Scott's request.
Roger B. Taney