1. sued for his freedom but lost solomon northrup 2. effectively repealed the missouri compromise roger b. taney 3. black freedman living in new york, captured and sold in the new orleans slave market dred scott

If taking about Dred Scott, it might be said that he sued for his freedom but lost. He was a slave and his freedom was denied even though he lived in a free territory. 
-Solomon Northrup was a back freedman who lived in New York. He was capture and sold into the New Orleans slave market.
-Roger B Taney repealed effectively the Missouri compromise.