A federal judge has approved a request to tightly control how evidence is shared with a Russian company accused of funding an Internet trolling operation to mislead American voters in the 2016 election. The dispute over how to protect sensitive materials from disclosure had threatened to stall prosecution of the sole defendant to appear in court to face charges in the indictment of Russian entities under special counsel Robert S. Mueller III. U.S. District Judge Dabney L. Friedrich of the District of Columbia said Friday that federal prosecutors gave “ample good cause” that identifying sources in the probe could tip...