-they were whitening
The word blanqueaban is the imperfect form of blanquear in the third person plural.
See the full blanquear conjugation


Sabía quiénes blanqueaban dinero.
They knew which people were laundering money.
El Mecanismo examinó información que indica que los diamantes de la UNITA quizás se blanqueaban haciéndolos pasar por la República Unida de Tanzanía.
The Mechanism examined information indicating that UNITA diamonds may be laundered through the United Republic of Tanzania.
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