I just started reading Stasi State or Socialist Paradise?: The German Democratic Republic and What Became of It, by Bruni de la Motte and John Green. It's a great analysis of the DDR.
Furthermore I'm reading Killing hope by William Blum. A great book about Amerikan interventions/coups.
And ofcourse the Communist Manifesto (again).
After those I want to read An Economic History of the USSR 1917-1991 and Mutual Aid: Building Solidarity During This Crisis (and the Next).