In June 2019, a regional politician who had defended Ms. Merkel’s refugee policy was shot dead on his front porch by a well-known neo-Nazi. The killer later told the court that he had attended a high-profile AfD protest a year earlier.
Since then, a far-right extremist has attacked a synagogue in the eastern city of Halle during a Yom Kippur service, leaving two dead and only narrowly failing to commit a massacre. Another extremist shot dead 9 mostly young people with immigrant roots in the western city of Hanau.
The AfD’s earlier rise in the polls stalled almost instantly after the Hanau attack.
“After these three attacks, the wider German public and media realized for the first time that the rhetoric of the AfD leads to real violence,” said Hajo Funke of the Free University in Berlin, who has written extensively about the party and tracks its evolution.
“It was a turning point,” he said. “They have come to personify the notion that words lead to deeds.”
Shortly after the Hanau attack, Thomas Haldenwang, the chief of the Office for the Protection of the Constitution, Germany’s domestic intelligence agency, placed elements of the AfD under surveillance for far-right extremism — even as the party’s lawmakers continued to work in Parliament.
“We know from German history that far-right extremism didn’t just destroy human lives, it destroyed democracy,” Mr. Haldenwang warned after announcing his decision in March last year. “Far-right extremism and far-right terrorism are currently the biggest danger for democracy in Germany.”