 His most famous case as a lawyer was "Brown v. Board of Education of Topeka", 347 U.S. 483 (1954), the case in which the Supreme Court ruled that "separate but equal" public education, as established by "Plessy v. Ferguson", was not applicable to public education because it could never be truly equal.In total, Marshall won 29 out of the 32 cases he argued before the Supreme Court.During the 1950s, Thurgood Marshall developed a friendly relationship with J. Edgar Hoover, the director of the Federal Bureau of Investigation.