hubieran censurado
-they/you had censored
Past perfect subjunctive ellos/ellas/ustedes conjugation of censurar.

censurar

Ex archivistas de la KGB seguramente entienden la importancia del material, de lo contrario no lo hubieran censurado.
Former KGB archivists certainly understood the importance of the material; otherwise they would not have censored it.
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