Is participation in a committee that approves investment projects financed by usurious banks considered a usurious transaction, and what is the ruling on the money earned from this participation?

There is no objection to benefiting from the wages earned from working in the committee for studying and approving investment projects, even if usurious banks finance them, as long as the approval does not involve an endorsement of usury. In that case, it is not permissible due to the assistance it provides to the forbidden and its endorsement. The wage is not unlawful, because it is in return for work that is originally permissible.