The Wall Street Journal’s documentary “Shadow Men: Inside Russia’s Secret War Company” goes deep inside the lethal global expansion of the Russian private military company Wagner.

Through interviews with current and former Wagner fighters, government insiders, victims of atrocities and war crimes investigators, the film reveals how the group, run by Yevgeny Prigozhin, had been hiding the flow of riches and resources through a complex network of front companies that ultimately led back to the Kremlin.