Mark Zuckerberg once described Facebook’s corporate culture as “move fast and break things”. But even the tech billionaire would struggle to keep up with events in his great-grandparents’ homeland. Last October the national conservative Law and Justice (PiS) won Poland’s general election but, for want of a parliamentary majority, lost power after two terms to a new pro-EU centre-left coalition led by prime minister Donald Tusk. For eight years Tusk and his political allies accused PiS of flouting domestic law and EU rules to capture key institutions such as public media, courts and the public prosecutor’s office. Now PiS leader...