Is the money that a husband takes from a company in exchange for bringing it work from other companies, then agrees with individuals to perform this work for less money, and they split the remainder, permissible or impermissible?

If the husband is an agent for the company, he must return the remaining amount if he carried out the work at a lower cost than what he was given, unless the company authorized him to keep the difference. In that case, he may keep it or share it with the workers.