Some 15,000 people took to the streets of Duisburg on Saturday, police said, to show their support for diversity and opposition to far-right extremism. That far exceeded the 5,000 who were registered for the gathering, a police spokeswoman said. The German Trade Union Federation (DGB) had called for the demonstration for social cohesion and against exclusion, hatred and hate speech. The union was joined by a broad alliance of political parties, charitable organizations, clubs and associations to send a “clear signal for a vibrant democracy,” the DGB said in a statement. Thousands of people hav…