your brother-in-law is a huge part of the immigration problem.
In some industries, those who hire illegal aliens can significantly undercut those who insist on hiring legal immigrants or Americans.
So the second group has a choice, they can hire illegals in order to compete, or they can lose all their business to the first group and go broke.
Individual business owners who do what they have to do to survive are not necessarily the villains of the piece. How exactly does their going out of business in favor of the other guy help the situation?
The answer is not to demonize those who adapt to what the market demands, but rather to enforce the laws so as to remove the competitive advantage of those who break them.