Original sentence: In the event both the Tsar and the rest of his immediate family were killed, though whether this was a decision of the central government or the local Soviet remains the subject of historical dispute (for the most recent and most extensive investigation into these murky events and into the question of who was ultimately responsible for the killings see The Fate of the Romanovs (2003) by Greg King and Penny Wilson
Edited sentence: In the event both the Tsar and the rest of his immediate family was executed, though whether this was a decision of the central government or the local Soviet remains the subject of historical dispute (for the most recent and most extensive investigation into these murky events and into the question of who was ultimately responsible for the killings see The Fate of the Romanovs (2003) by Greg King and Penny Wilson.Terror and political coercion were thus to become an established feature of the Soviet system, growing in intensity over the years, reaching an apex in the late 1930s under Joseph Stalin