The Federal Trade Commission, along with a coalition of states, took decisive action today to stop collusion between the nation’s largest advertising agencies that distorted America’s modern public square. Starting in 2018, major U.S. advertising agencies WPP, Publicis and Dentsu—who buy digital ad inventory on behalf of advertisers—unlawfully colluded to impose common “brand safety” standards across the digital advertising industry, according to the FTC’s complaint. The ad agencies, together with their primary competitors Omnicom and IPG, operated through trade associations to establish a common “Brand Safety Floor” to target “misinformation.” The complaint alleges firms like NewsGuard and the Global Disinformation...