Which is a Supreme Court decision that ruled that the Constitution protected slavery?

The Supreme Court decision that ruled the Constitution protected slavery was the 1857 case Dred Scott v. Sandford. In this landmark ruling, the Court held that African Americans could not be considered citizens and therefore had no rights to sue in federal court. Additionally, it declared that Congress lacked the authority to prohibit slavery in the territories, effectively affirming the legality of slavery and intensifying national tensions over the issue.