Trouble, even when expected, can come at unexpected times. For many months, Russians have expected that authorities would begin to block Internet sites that publish opinions from opposition leaders, activists and supporters. But when a number of sites were blocked on Thursday morning, it was like a bolt out of the blue. The Federal Mass Media Inspection Service blocked access to the website of the Ekho Moskvy radio, the online publications Ej.ru, Grani.ru and Kasparov.ru, the homepage of world chess grandmaster Gary Kasparov. The legal justification was the so-called Lugovoi law, named after its author, State Duma Deputy Andrei Lugovoi....