Controversial German singer Xavier Naidoo playing to a sell-out crowd at the Lanxess Arena in the city of Cologne. Photo: Reuters/Kadir Caliskan One of Germany’s most popular singers has lost a legal battle over whether he can be legitimately labeled an “antisemite” as a result of his public statements and ties with an extremist group. On Wednesday, the Federal Constitutional Court in Karlsruhe overturned previous lower court rulings in favor of the singer, Xavier Naidoo. The recipient of several music awards in Germany, Naidoo has a long record of promoting conspiracy theories and has spoken at meetings of the “Reichsbürger”...