Monday’s attack on Bremen’s Alternative for Germany (AfD) leader Frank Magnitz is not the first time the far-right populist party has been targeted in the northern German city. In the past, windows have been smashed and a car vandalized. Yet the brutal beating of Magnitz does mark a new level of violence in Bremen. The 66-year-old Magnitz, who remains hospitalized, was reportedly set upon by masked assailants, who struck the parliamentarian in the head with an object. When Magnitz went to the ground, the attackers apparently continued beating him. Passersby ultimately came to his aid. Bremen’s police and state security...