Is it permissible for a man's father-in-law to travel with a non-Muslim worker (Christian or Hindu) to a foreign country to help him work there, and is the money taken from the worker for that permissible?

This issue falls under "the price of influence," which is when a person uses their influence to help another obtain their right, despite unlawful obstacles. An example of this is a person of standing striving to remove injustice from the oppressed. Scholars have differed on the ruling of taking money for this effort. Some have absolutely forbidden it, some have deemed it reprehensible, and others have elaborated, permitting the taking of a customary wage if the person of influence incurs expenses, effort, or travel. This last opinion is the most preferred.

Accordingly, the basic ruling is that it is permissible for the husband's brother to take money for his work in assisting the worker, provided that what he takes does not exceed the customary wage, that it does not violate the contract by which the worker obtained the visa, and that it does not involve lying to officials, such as claiming the worker has absconded.