Google 'rigged the rules' of online display advertising for years and must be held 'accountable,' lawyers for the U.S. Department of Justice told a court.
The tech giant was accused of operating a 'rapacious' monopoly and being an 'authoritarian intermediary' as it controls how publishers and advertisers interact.
DOJ lawyers set out their case in closing arguments on Monday following a three-week antitrust trial that took place in September.
The case centers on the billions of adverts that are bought and sold daily on web pages, including those of news publishers.
Sales are 'programmatic,' meaning automated auctions taking milliseconds are held.