The Little Regulator at Center of Facebook’s Big Data Fight

A little-known U.K. regulator is taking Silicon Valley head-on, finding itself at the heart of a scandal that has shaken governments and caused Facebook Inc.’s shares to plummet.The Information Commissioner’s Office may get a warrant as early as Wednesday to search Cambridge Analytica -- the British firm at the center of a dispute over the misuse of Facebook Inc. users’ data -- after the company failed to respond to an access request.Now the data-protection watchdog is facing down the company linked to ex-U.S. presidential adviser Stephen K. Bannon and major Republican donor Robert Mercer as public outrage over the use of internet data is growing. U.K. Information Commissioner Elizabeth Denham will ...