Open this photo in gallery: Hans-Georg Maassen attends a news conference in Berlin in 2018.HANNIBAL HANSCHKE/Reuters Hans-Georg Maassen, who until five years ago was responsible for protecting Germany against violent and extremist threats to its democracy, is himself now being monitored by the security agency he ran, the bureaucrat-turned-politician said. Maassen was dismissed as head of Germany’s Office for the Protection of the Constitution (BfV) in 2018 after appearing to play down the threat of violence by right-wing extremists who at the time were rioting in an eastern German city. Since, the lawyer has become known for his increasingly radical...