hubieran callado
Past perfect subjunctive ellos/ellas/ustedes conjugation of callar.

callar

Seguro que se hubieran ahorrado mucho dolor si se hubieran callado, si hubieran dejado de escribir y de transmitir la verdad.
They sure would have saved themselves a lot of grief if they would've walked away, if they would've stopped writing and broadcasting the truth.
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