Gilberto Concepción de Gracia was a steadfast voice for Puerto Rican independence, actively opposing colonial subjugation through various nationalistic movements from the 1930s to the 1950s. He participated in significant events including the Ponce massacre, the establishment of the Puerto Rican Independence Party, and protests against U.S. claims of decolonization at the UN. Concepción de Gracia's commitment to justice and dignity highlights his influential role in the struggle for Puerto Rican autonomy.