CNN — The Justice Department and eight states sued Google on Tuesday, accusing the company of harming competition with its dominance in the online advertising market and calling for it to be broken up. The move marks the Biden administration’s first blockbuster antitrust case against a Big Tech company. The eight states joining the suit include California, Colorado, Connecticut, New Jersey, New York, Rhode Island, Tennessee and Virginia. The fresh complaint significantly escalates the risks to Google emanating from Washington, where lawmakers and regulators have frequently raised concerns about the tech giant’s power but have so far failed to pass new legislation or regulations that might reinstate the company or its peers. For years, Google’s critics have claimed that the company’s extensive role in the digital ecosystem that enables advertisers to place ads, and for publishers to offer up digital ad space, represents a conflict of interest that Google has exploited anticompetitively. In Tuesday’s complaint, a copy of which was viewed by CNN, the Justice Department alleged that Google actively and illegally maintained that dominance by engaging in a campaign to thwart competition. Google gobbled up rivals through anticompetitive mergers, the US government said, and bullied publishers and advertisers into using the company’s proprietary ad technology products. For 15 years, Google’s alleged anticompetitive behavior led to lower ad revenues for websites and publishers, as well as higher advertising costs for marketers, said Attorney General Merrick Garland during a press conference Tuesday. Even the US government was harmed, according to the complaint, which named the US Army as one of multiple government advertisers using Google’s tools. Since 2019, the US government has spent $100 million buying online ads, the complaint said. As part of the lawsuit, the US government called for Google to be broken up and for the court to order the company to spin off at least its online advertising exchange and its ad server for publishers, if not more. Google, the US government alleged, “has corrupted legitimate competition in the ad tech industry by engaging in a systematic campaign to seize control of the wide swath of high-tech tools used by publishers, advertisers, and brokers, to facilitate digital advertising. Having inserted itself into all aspects of the digital advertising marketplace, Google has used anticompetitive, exclusionary, and unlawful means to eliminate or severely diminish any threat to its dominance over digital advertising technologies.” The suit was filed in the US District Court for the Eastern District of Virginia. Tuesday’s suit marks the federal government’s second antitrust complaint against Google since 2020, when the Trump administration sued over Google’s alleged anticompetitive harms in search and search advertising. That case is still ongoing. Google has also been the target of antitrust litigation by state and private actors. In a statement, Google said the DOJ suit “attempts to pick winners and losers in the highly competitive advertising technology sector.” “DOJ is doubling down on a flawed argument that would slow innovation, raise advertising fees, and make it harder for thousands of small businesses and publishers to grow,” a Google spokesperson said, adding that a federal judge last year knocked down a claim that Google colluded with Facebook in a separate antitrust suit led by the state of Texas. That judge also ruled, however, that a number of monopolization claims in the Texas case could move forward. Asked to respond to Google’s statement, Garland said Tuesday: “We don’t pick winners or losers. We pick those who violate the antitrust laws. Those are the people we sue.” The lawsuit is a frontal assault against Google’s massive, primary business of advertising. Google generated $209 billion in advertising revenue in 2021, according to its annual report, a figure representing more than 80% of its total revenue. By comparison, the next largest giant in online advertising, Facebook-parent Meta, generated $115 billion in 2021. (Tuesday’s suit targets a subset of Google’s ad revenue represented by display advertising, a roughly $32 billion business for the company.) Third-party Estimates suggest that Google and Facebook account for the majority of US digital ad revenues, hitting a peak around 2017, with Google taking about a third of the market. Since then, however, others including Amazon have begun encroaching on that business. The US complaint echoes concerns that have prompted similar antitrust investigations in the United Kingdom and in the European Union. Google not only controls the platform publishers use to sell online ad inventory, the Justice Department alleged Tuesday, but also the advertising tools marketers use to claim that inventory and the exchange that facilitates those transactions. “Google’s pervasive power over the entire ad tech industry has been questioned by its own digital advertising executives,” the complaint said, “at least one of whom aptly begged the question: ‘[I]s there a deeper issue with us owning the platform, the exchange, and a huge network? The analogy would be if Goldman or Citibank owned the NYSE.’” Tuesday’s complaint marks an opening salvo against Big Tech by DOJ’s antitrust chief, Jonathan Kanter. Kanter has spent months laying the groundwork for a broader offensive against the tech industry’s most dominant companies, reflecting Biden’s commitments by President Joe and others in the US government to hold powerful accountable firms. Under Kanter, Justice Department antitrust officials have pushed to bring more cases to trial as well as to prosecute cases involving unconventional legal theories. On Tuesday, Kanter told reporters that Google abused “longstanding monopolies in digital advertising technologies” to give itself an advantage. “Google’s own documents estimate that it keeps at least 30 cents of each advertising dollar that flows through Google’s advertising tools,” Kanter said, adding that in some situations the figure may be far higher. In 2020, House lawmakers released a 450-page report finding that Google, along with Amazon, Apple and Facebook, hold “monopoly power” in key business segments. The report was the result of a 16-month investigation in which congressional staff reviewed corporate documents and interviewed the tech industry’s many customers and rivals. It concluded, among other things, that Google was uniquely positioned to benefit from its powerful role in the online ad industry. “With a sizable share in the ad exchange market and the ad intermediary market, and as a leading supplier of ad space, Google simultaneously acts on behalf of publishers and advertisers, while also trading for itself,” the report said.