Yale professor and historian Timothy Snyder has sounded alarm bells about autocracy and fascism for several years now, in both his scholarly and popular books about Russian and German history. Whether you’ve followed his warnings or just started paying attention, it’s not too late to get caught up on the lessons he brings from his rigorous studies of 20th century totalitarianism. To make his relevant points more accessible, Snyder has distilled them over the years, aiming at the widest popular audience.