Who called far an end to the dual education system and suggested that separate was not equal?

The call for an end to the dual education system and the assertion that "separate but equal" was not truly equal were famously articulated by Thurgood Marshall, the chief counsel for the NAACP during the landmark case Brown v. Board of Education in 1954. The Supreme Court's unanimous decision in this case declared racial segregation in public schools unconstitutional, emphasizing that segregated educational facilities are inherently unequal. Marshall's advocacy played a crucial role in challenging the legality of segregation in education.