The Supreme Court held that Dred Scott (a freed slave) was not a citizen and not entitled to sue in federal court. The Chief Justice that wrote the opinion said that Black people could never be US citizens because of their race.
This infuriated the abolitionists who believed slavery was immoral and illegal. There was nothing the abolitionists could do to alter the Court's decision.
Abolitionists were outraged by the Supreme Court's decision in the Dred Scott case, as it ruled that African Americans, whether free or enslaved, were not citizens and therefore did not have the right to sue in federal court. They saw this decision as a setback to the abolitionist movement and a reinforcement of the institution of slavery.
majority opinion
Judicial Review
By issuing a judicial review.
no one knows
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other courts use the decision as a guideline when they rule on similar cases