What is the ruling on subscribing to the Employees' Fund, where a portion of the monthly salary is deducted and the fund is supported by the factory, knowing that the fund lends to employees with interest that reverts to it, and the subscriber does not borrow from it?

Voluntary participation in this fund is impermissible because its money is invested in haraam (unlawful) matters such as usury (riba). The fact that a person does not intend to borrow from it does not make his participation permissible, for the one who consumes usury, the one who provides it, and the one who assists in it are all equal in sin. As for whoever is coerced into participating, the sin falls upon the employer. The participant is permitted to take back what was deducted from him and any grants from the fund, but he is not allowed to take the usurious interest.