Department of Justice will charge Google with multiple violations of federal antitrust law today

The lawsuit will kick off a legal war between Washington and Silicon Valley, one that could have vast implications not only for Google but the entire tech industry.

The Department of Justice is expected Tuesday to charge Google with violating federal antitrust law, according to two people familiar with the matter, finding after a year-long investigation that the tech giant wrongfully wielded its digital dominance to the detriment of corporate rivals and consumers.

The federal government’s imminent lawsuit will touch off a landmark and lengthy legal war between Washington and...