Alphabet's Google plans to appeal against the "adverse" portion of the court decision in the U.S. Department of Justice’s monopoly case against the technology giant.

The tech giant may be forced to sell parts of its highly profitable advertising technology unit, disrupting a business with huge power over what consumers see online.

Google illegally acted to preserve “monopoly power” in the ad-tech business, a federal judge ruled Thursday. It’s the second antitrust case brought by the U.S. government that has gone against the internet giant in the past year.