The third mammoth trial linked to the “Reich Citizens” extremist movement in Germany started in the southern city of Munich on Tuesday. The trial concerns a group of suspects linked to Prince Heinrich XIII of Reuss, who prosecutors say was a key figure in an alleged conspiracy to overthrow the German government. Some defendants only partially covered their faces from the press cameras with a folder or newspaper at the start of the trial. Others were apparently indifferent to the presence of journalists. Proceedings were briefly disrupted by heckling from the public gallery, but then the defend…