Who fought in court to prove the term separate but equal was unconstitutuianail?

The landmark case that challenged the "separate but equal" doctrine was Brown v. Board of Education, which was argued before the U.S. Supreme Court in 1954. Thurgood Marshall, representing the NAACP, led the legal team that fought to prove that racial segregation in public schools was inherently unequal and violated the Equal Protection Clause of the Fourteenth Amendment. The Court ultimately ruled in favor of desegregation, declaring that separate educational facilities are inherently unequal. This decision effectively overturned the precedent set by Plessy v. Ferguson in 1896.