Which policy do the plaintiffs disagree with in Brown v. Board of Education?

In the decision, issued on May 17, 1954, Warren wrote that “in the field of public education the doctrine of ‘separate but equal’ has no place,” as segregated schools are “inherently unequal.” As a result, the Court ruled that the plaintiffs were being “deprived of the equal protection of the laws guaranteed by the 14th Amendment.”