First black Justice in the United States Supreme Court. Appointed in 1967 by LBJ. As a lawyer, he also successfully argued before the Supremes that separate but equal education was unconstitutional in Brown vs. Board of Education of Topeka in 1954. Most of his other big cases were variations on trashing the stupid separate but equal laws and Jim Crow laws of the South.
Marshall was a steadfast liberal during his years on the bench, until he stepped down in 1991.