On March 21 , 1937 , there was a peaceful civilian march that took place on Palm Sunday in Ponce , Puerto Rico . The police began shooting their firearms at those present and 19 civilians and two policemen were killed , The shootings by the police became known as the Ponce massacre . This event influenced her nationalistic views even further and she joined the New York cell of the Nationalist Party in 1937
Ponce massacre
Ponce massacre
Rosa Collazo