On March 21 , 1937 , Rosado was listening to the radio , where she heard the events involving what is known as the Ponce massacre . That day the Puerto Rican Nationalist Party held a peaceful march in the city of Ponce , Puerto Rico , commemorating the ending of slavery in Puerto Rico by the governing Spanish National Assembly in 1873 , and coinciding with a protest against the incarceration by the government of the United States of America government of nationalist leader Pedro Albizu Campos on sedition charges , The participants and innocent bystanders were fired upon by the Insular Police , resulting in the death of 17 unarmed civilians and two policemen , plus the wounding of some 235 civilians , including women and children . The Insular Police , a force somewhat resembling the National Guard , answered to orders of the U.S. appointed governor of Puerto Rico , General Blanton Winship . The outcome of the Ponce massacre served as an influential factor in her decision to join the Nationalist Party and to become a follower of Pedro Albizu Campos
Ponce massacre
Ponce massacre
Isabel Rosado