What case did Thurgood Marshall argue which established the unconstitutionality of separate schools for black and white students?
Thurgood Marshall:  Prior to his judicial service, he successfully argued several cases before the Supreme Court, including "Brown v. Board of Education". Brown v. Board of Education: Brown v. Board of Education of Topeka, 347 U.S. 483 (1954) , was a landmark United States Supreme Court case in which the Court declared state laws establishing separate public schools for black and white students to be unconstitutional.
Brown v. Board of Education