enfurecían
-they were infuriating
The word enfurecían is the imperfect form of enfurecer in the third person plural.
See the full enfurecer conjugation

enfurecer

Desde su cuarto del hospital, seguía las noticias que empezaban a salir de la masacre de Haditha y otras atrocidades estadounidenses en Iraq, que le enfurecían.
She had been following the news of the Haditha massacre on the TV in her hospital room and the other U.S. atrocities in Iraq starting to come to light and was thoroughly outraged.
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