The case may be joined by state attorneys general in what would be one of the biggest antitrust actions by the United States since the late 1990s. WASHINGTON — The Justice Department is planning to file antitrust charges against Google as early as this summer, said two people with knowledge of the situation, in what would be one of the biggest antitrust actions by the United States since the late 1990s. The Justice Department is still investigating the internet company and has been making progress on its case, said the people, who spoke on the condition of anonymity because the...