It was early evening in Berlin, just a day before Christmas Eve, when Josephine Ballon got an unexpected email from US Customs and Border Protection. The status of her ability to travel to the United States had changed-she'd no longer be able to enter the country. At first, she couldn't find any information online as...

This is today's edition ofThe Download,our weekday newsletter that provides a daily dose of what's going on in the world of technology. What it's like to be banned from the US for fighting online hate Just before Christmas the Trump administration dramatically escalated its war on digital rights by banning five people from entering the...