What previos case did warren here reverse?

In the landmark case of Brown v. Board of Education (1954), Chief Justice Earl Warren reversed the precedent set by Plessy v. Ferguson (1896), which upheld the doctrine of "separate but equal." Warren's ruling declared that racial segregation in public schools was inherently unequal, thus unconstitutional under the Equal Protection Clause of the Fourteenth Amendment. This decision was a significant step towards desegregation and civil rights in the United States.