WASHINGTON—When Deputy Attorney General Jeffrey Rosen announced the Justice Department’s antitrust lawsuit against Google last week, the moment provided a career bookend for the nation’s No. 2 law-enforcement official, who was a figure in the last big antitrust battle over tech dominance two decades ago.
Mr. Rosen, 62 years old, has emerged as the public face for the government’s claims that the search giant is illegally preserving its monopoly status by engaging in anticompetitive tactics that shut out future innovators from…
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