Justice Department Files Antitrust Case Against Google

The Justice Department filed an antitrust lawsuit Tuesday alleging that Google engaged in anticompetitive conduct to preserve monopolies in search and search-advertising that form the cornerstones of its vast conglomerate, according to senior Justice officials.

The long-anticipated case, iled in a Washington, D.C., federal court, marks the most aggressive U.S. legal challenge to a company’s dominance in the tech sector in more than two decades, with the potential to shake up Silicon Valley and beyond. Once a public darling, Google attracted considerable scrutiny over the past decade as it gained...