The IRS has launched a campaign to examine whether wealthy taxpayers are violating the law when using their ownership of sports teams to save large amounts in taxes.

The effort will focus on sports industry entities that are reporting “significant tax losses” to “determine if the income and deductions driving the losses” are lawful, according to the IRS announcement earlier this year. That announcement, which consisted of one sentence on a webpage devoted to compliance campaigns by the IRS division that focuses on large businesses, did not specify what kinds of abuses the agency will be looking for.