An estimated 50,000 people attended the latest, and biggest, in a series of protests against Czech Prime Minister Andrej Babiš on Prague’s Wenceslas Square on Tuesday evening. Demonstrators condemn his appointment of Marie Benešová as justice minister, fearing that move could influence a criminal case of alleged EU subsidy fraud involving Mr. Babiš. But how much impact can these protests actually have? That’s a question for political scientist Jiří Pehe.