The police registered 1,453 anti-Semitic incidents in Germany last year, more than in five of the previous seven years, and organizations including the American Jewish Congress say fewer than a third of such incidents get reported. Their stubborn persistence in the country where the Holocaust was plotted and executed is raising concern that decades of work to eradicate anti-Semitism are slowly being undone as prejudice against Jews spreads beyond its traditional home in the far right.