That would be an antitrust violation.
"NCAA v. Board of Regents of the University of Oklahoma, 468 U.S. 85 (1984), was a case in which the Supreme Court of the United States held that the National Collegiate Athletic Association (NCAA) television plan violated the Sherman and Clayton Antitrust Acts. These antitrust laws were designed to prohibit group actions that restrained open competition and trade." https://en.wikipedia.org/wiki/NCAA_v._Board_of_Regents_of_the_University_of_Oklahoma