had been freeing
Past perfect progressiveconjugation offree.There are other translations for this conjugation.

free

The main demands of this rally had been freeing the Puerto Rican political prisoners, an end to U.S. colonialism and self-determination for Puerto Rico.
Las principales demandas eran: libertad para los presos políticos, fin al colonialismo yanqui y autodeterminación para Puerto Rico.
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