Federal and state regulators and congressional committees are sharpening their focus on America’s tech giants, especially whether they have too much power — with too little oversight and too few safeguards — over people’s lives and personal information.

Inquiries and Investigations: 8 Federal 6 State and Local 2 Congress

The backlash over big tech is one of the few areas where Democrats and Republicans are increasingly in agreement, with President Trump, lawmakers of both parties and Democratic presidential candidates becoming more vocal in expressing their concerns about the industry’s influence.

Google and Facebook, for example, account for most online advertising. Nearly half of all Americans own an Apple iPhone, and about the same number buy products from Amazon.

After years of scrutiny by European officials, the widening inquiries into these companies in the United State could ultimately result in some of them being broken up, and in new laws that might alter the balance of corporate power. This is what they’re facing.

Google has been under fire for the near stranglehold it has in internet search, whether it uses that power to the detriment of others and whether platforms like YouTube have gotten so large that their advertising practices have been creating harm for certain groups of people.

In Europe, Google has been fined for unfair advertising practices, for favoring its own services over those of rivals and for forcing phone makers to include its apps if they want to use its Android operating system.

The world’s largest social network has attracted government attention on a number of fronts, including its policies related to users’ privacy, whether certain advertising tools enable housing discrimination, its plans to create a new form of currency and whether its sheer size has stifled potential rivals.

Facebook owns several of the world’s largest messaging and social sharing apps, including WhatsApp and Instagram, making its market power even more formidable.

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The principal concerns about Apple appear to center on whether it is unfairly wielding the power of its App Store to hurt competitors.

After a spate of unusual negotiations, the Justice Department and the Federal Trade Commission, which share authority over antitrust issues, divvied up companies to focus on, with the Justice Department taking on Apple. Separately, the department said that it would establish a task force to look at anticompetitive behavior across the industry.

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Concerns about the retail behemoth have focused on its marketplace and whether Amazon favor its own private-label goods over products from so-called third-party sellers. Given that Amazon controls the marketplace, lawmakers have said, it may have data, placement power and other unfair advantages over rivals.

Senator Elizabeth Warren, Democrat of Massachusetts and a presidential candidate, is among those questioning Amazon’s power. “You can be an umpire, or you can be a player,” she said. “But you can’t be both.”