Meredith Whittaker practises what she preaches. As the president of the Signal Foundation, she’s a strident voice backing privacy for all. But she doesn’t just spout ­hollow words.In 2018, she burst into public view as one of the organisers of the Google walkouts, mobilising 20,000 employees of the search giant in a twin protest over the company’s support for state surveillance and failings over sexual misconduct.Even now, after half a decade in the public eye, with ­congressional testimonies, u...