Dred Scott and his family were moved from Missouri to Illinois to the Wisconsin Territory and back to Missouri.
Then I'll sue you!
I want to buy my freedom!
I don't think I can do that...
He lost at state court.
And again at the circuit court.
The Supreme Court reviewed his case and ruled that because of the fifth amendment, that talks about due process, the government cannot take a slave away from their master. They also decided that blacks are not citizens under the Constitution so Scott could not sue his owner.