What is the ruling on the commission taken by a company manager from a contractor whom he nominates to the client, without the company's knowledge, after his company's work is finished and it has received all its dues, and without his influence on prices?

The manager taking a commission in exchange for nominating a contractor to his company involves a suspicion of corruption and a presumption of diminishing the company's rights, because it may lead to favoritism in contracting. Therefore, it is necessary to avoid taking this commission, unless the manager informs the company of it and the company grants him permission.