What is the ruling on money taken from selling visas to foreign workers and from the monthly fees they pay, knowing that they do not work for the institution, and that some of them are still present while others have left?

Selling visas is impermissible because it involves deception, fraud, and unlawful consumption of wealth, as Allah Almighty says: (And do not consume your properties among yourselves through falsehood). The price of the visas and the percentages taken from the workers are unlawful gains that must be disposed of. The price of the visas should be spent on charitable and good causes. As for the money taken from the workers as a monthly percentage, it must be returned to them. If it is not possible to reach them, then it should be given as charity on their behalf. The seller must repent, persist in repentance, and not return to this practice.