What significant legal case is Thurgood Marshall known for winning?

Thurgood Marshall is best known for his role in the landmark case Brown v. Board of Education, which was decided by the Supreme Court in 1954. This case was pivotal in the American civil rights movement as it declared that racial segregation in public schools was unconstitutional. It overturned the earlier precedent set by Plessy v. Ferguson, which had upheld the "separate but equal" doctrine, thereby legitimizing segregation. Marshall, as the chief counsel for the NAACP Legal Defense and Educational Fund, argued that segregated schools were inherently unequal and deprived minority children of equal educational opportunities. The ruling was a significant step toward the desegregation of schools across the United States and was instrumental in advancing civil rights by setting a legal precedent that challenged segregationist policies.