WASHINGTON—Ten states sued Google Wednesday, accusing the search giant of running an illegal digital-advertising monopoly and enlisting rival Facebook Inc. in an alleged deal to rig ad auctions that was code-named after “Star Wars” characters.

The complaint, filed in U.S. District Court in Texas, alleges that Facebook emerged in 2017 as a powerful new rival to Google, challenging the Alphabet Inc. unit’s established dominance in online advertising. Google responded by initiating an agreement in which Facebook would curtail its competitive moves, in return for guaranteed special treatment in Google-run ad auctions, the lawsuit claims.

Google’s internal code name for the alleged Facebook deal referenced characters from Star Wars, according to the suit, which redacted specifics. A person familiar with the matter said the code name was “Jedi Blue,” after the sci-fi franchise’s Jedi knights.

“Google is a trillion-dollar monopoly brazenly abusing its monopolistic power, going so far as to induce senior Facebook executives to agree to a contractual scheme that undermines the heart of [the] competitive process,” Texas Attorney General Ken Paxton, who led the suit, said in a statement.

The accusations opened up a fresh front of criticism for both tech giants, each of which face federal antitrust lawsuits filed in recent weeks.

This post first appeared on wsj.com

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