What is the ruling on money taken from workers in an agricultural institution who work for themselves in shops registered in the name of the institution's owner, knowing that their payment of the money is with their consent? And what is the ruling on disposing of it if it is unlawful? And what is the ruling on taking money from sponsored individuals or in exchange for the visas they request?

Sponsorship (kafalah (definition)) is a contract of benevolence, not one of exchange, so it is not permissible to take compensation for it. This is based on the Prophet, peace and blessings be upon him, who said: "Whoever intercedes for his brother with an intercession, and then he is given a gift for it, and he accepts it, he has approached a great door from the doors of riba (usury/interest)." However, it is permissible to take what is equivalent to the effort or money expended in completing transactions, without any increase intended for profit. As for the work of sponsored individuals in unofficial capacities, it is less severe, unless it leads to corruption. And whoever has taken unlawful money from workers must return it to them or seek their forgiveness. If he cannot reach them, he should give the value of their right in charity.