One would have thought that the proudly announced indictment of 13 Russians and three Russian companies for election related crimes went to the heart of his assignment. The Department of Justice posted the indictment online here.
Mueller failed to anticipate that any of the defendants would appear in court to defend against the charges. Rather, Mueller obtained the indictment to serve a public relations purpose, laying out the case for interference as understood by the government and lending a veneer of respectability to the Switch Project.
