Years of blowback against America’s biggest tech companies will likely come to a head this summer as the Justice Department expects to file antitrust charges against Google. The investigation is still ongoing: But regulators expect to bring charges related to Google’s dominance in the ad market (it takes in roughly one-third of all dollars spent on advertising) and harming competitors through its search rules. This will likely be the biggest antitrust action in the U.S. since the DOJ went after Microsoft in the 1990s.