DOJ
DOJ is the abbreviation for the United States Department of Justice. It prosecutes crimes at the federal level and sues companies that it believes are hindering competition – which is why it regularly appears in tech news.
DOJ stands for “Department of Justice,” the justice ministry of the United States. It is a US government agency with around 115,000 employees. Two tasks are particularly important: it prosecutes crimes that are punishable under US federal law. And it appears in court as the state’s advocate when the government itself sues or is sued. At its head stands the Attorney General, a mix of justice minister and top prosecutor. For technology and financial news, the DOJ’s competition division is especially relevant – the so-called Antitrust Division.
Why tech giants fear the DOJ
The DOJ can sue large companies if it believes they are abusing their market power. Such proceedings are called antitrust cases. They are not directed against individual crimes, but against a business model. That is exactly what makes them so dangerous for corporations.
Because the DOJ can demand that a company sell off parts of itself. This is called a breakup or divestiture. In 2024, a US court ruled that Google holds an illegal monopoly in internet search. This was based on a DOJ lawsuit. In the dispute over the consequences, the agency demanded, among other things, that Google give up its Chrome browser.
For investors, such news poses share price risks. A DOJ lawsuit can run for years and move the stock price significantly. At the same time, the DOJ reviews corporate mergers. If it blocks a merger, a billion-dollar deal falls through – often with hefty penalties for the companies involved.
From investigation to verdict
It usually starts with an investigation. The DOJ requests internal emails, contracts, and data, and questions employees. This part can take years and often proceeds without the public learning any details. Only once the agency sees enough material does it file a lawsuit with a federal court.
Important: the DOJ does not decide on guilt itself. It is the prosecuting party; a judge or a jury decides. Many proceedings, however, end beforehand through a settlement. The company then commits to changes, such as no longer blocking competitors, and the case is dropped.
When it comes to reviewing mergers, the DOJ shares the work with a second agency, the Federal Trade Commission (FTC). The two coordinate on who takes which case. Roughly speaking: the DOJ is more often responsible for search engines, telecommunications, and advertising markets, while the FTC tends to handle online retail and social networks. This is not a fixed rule, though.
Where the name appears in headlines
In the news, you read sentences like “the DOJ has filed a lawsuit” or “the DOJ is reviewing the acquisition.” In recent years, almost all major tech companies have been affected: Google over search and online advertising, Apple over its closed iPhone system, Amazon and Meta mainly through the FTC. The AI boom is also coming into focus, for instance the close ties between chip makers, cloud providers, and AI startups.
A common misconception: the DOJ is not a data protection authority and not a court. Nor does it set AI rules, as the EU does with its laws. It applies existing law – and retroactively, if it suspects violations.
For European readers, it’s worth comparing this to the European Commission. The Commission can impose fines on competition matters itself, without having to sue first. The DOJ, by contrast, must go to court and win. That’s why US proceedings drag on longer, but in the end sometimes cut deeper into a company’s structure.