had been mistreating
-había estado maltratando
Past perfect progressiveconjugation ofmistreat.There are other translations for this conjugation.

mistreat

The bad blood between Aponte and Castillo goes back to the 1990s when the journalist reported that Castillo had been mistreating homeless people in the city.
La animosidad entre Aponte y Castillo se remonta a la década de los años 90, cuando el periodista informó que Castillo había maltratado en la ciudad a personas sin hogar.
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