 (He and his sisters couldn't go because they were sick with measles).The march, which was scheduled for March 30 (Palm Sunday), was organized to commemorate the ending of slavery in Puerto Rico by the governing Spanish National Assembly in 1873, and to protest the incarceration by the U.S. Government of Nationalist leader Pedro Albizu Campos on sedition charges.Upon learning of the planned protest, however, the colonial Governor of Puerto Rico at the time, General Blanton Winship, who had been appointed by US President Franklin Delano Roosevelt, demanded the immediate withdrawal of the permits.