This is a story about massacres that occurred in Southern Ukraine between 26th October and 7th December, 1919. The victims, avowedly-pacifist German Mennonites, included several women and elderly people; in Eichenfeld, almost one third of the village population was killed, including a 65 year-old blind woman. All the massacres occurred in the vicinity of the Makhnovist army. And then, after six weeks, they stopped.
The Russian revolution in retreat, 1920-24: Soviet workers and the new communist elite - Simon Pirani
Paresth Chattopadhyay's book elaborating on Marx's concept of capital and applying it to the economy of the 'Soviet' Union, attempting to show how the production, reproduction and accumulation of capital continued within 'actually-existing socialism', as well as critiquing alternative theories of the fSU as 'socialism' or 'neither socialism nor capitalism'.
Ante Ciliga,Trotsky, and State Capitalism: Theory, Tactics, and Re-evaluation during the Purge Era, 1935-1939 - Michael S Fox
Michael S. Fox on Trotsky and state capitalism during Stalin's purges. In PDF format.