Answer: The correct answer is : Charles Hamilton Houston was a lawyer from the United States who participated in the dismantling of the laws of Jim Crow and also intervened in the prohibition of racial segregation in the public schools of the United States. Houston had suffered racism during the Second World War when he was in the army. He worked hard for human rights, he died early and he could not see the annulment of the laws and the social victories that were obtained by his effort. He wanted a society with equal value for all people. On this principle and with his doctrine called "separate but equal" he based his training for African-American lawyers, emphasizing that inequality existed in the educational opportunities of blacks and whites. He was too demanding as a teacher, he demanded excellence. The students called it "iron shoes and cement pants".