The Mueller Report Will Be Released on Thursday. Here’s a Guide.

After 23 months, 500 search warrants, 2,300 subpoenas and a string of indictments, the results of the investigation by the special counsel, Robert S. Mueller III, will be public on Thursday in a nearly 400-page report. The treatise is likely to add significantly to our understanding of Russia’s 2016 election interference and President Trump’s efforts to control federal inquiries into the matter.

Attorney General William P. Barr said last month that the special counsel did not find that anyone associated with the Trump campaign worked with the Russian government to...