 Corretjer was sent to the infamous La Princesa prison for one year in 1937, because he refused to hand over to the American authorities the Book of Acts of the Nationalists Party, as result of his political beliefs.In 1937 a group of lawyers, including a young Gilberto Concepción de Gracia, tried in vain to defend the Nationalists, but the Boston Court of Appeals, which held appellate jurisdiction over federal matters in Puerto Rico, upheld the verdict.Albizu Campos and the other Nationalist leaders were sent to the Federal penitentiary in Atlanta, Georgia.