A nonprofit that fights on behalf of journalists has asked the federal appeals court in Washington, D.C., to make public filings in the fight over a mystery grand jury subpoena thought to be tied to special counsel Robert Mueller’s Russia investigation.In a 33-page motion filed Wednesday, The Reporters Committee for Freedom of the Press argued that the First Amendment and common law require at least some documents to be made available to the public. The D.C. Circuit Court of Appeals last month upheld a lower court order that found a foreign government-owned company in contempt and imposed a $50,000 fine...