Romanian authorities took mercenary leader Horațiu Potra into custody Thursday on charges of attempting to subvert the constitutional order, following allegations he had helped plan a violent coup during last December’s fraught election period. Potra was extradited from Dubai, where he had been detained since Sept. 24 alongside his son Dorian and grandson amid an investigation of a plot to use force to install former ultranationalist presidential candidate Călin Georgescu in power. “Romanian