Special counsel Robert Mueller said in filing Wednesday that materials in his criminal case against a Russian troll farm were released and apparently used in a “disinformation campaign” aimed at discrediting his ongoing investigation into Russian interference in the election. Prosecutors with the special counsel’s office made the disclosure in a motion in the case involving Concord Management and Consulting that opposed the defendant’s request that “sensitive” discovery files be disclosed to the Russian company’s “officers and employees” for the purpose of preparing for trial. “Certain non-sensitive discovery materials in the defense’s possession appear to have been altered and disseminated...