Been listening to a fair few of the books Red Circle has posted up for free, latest being this one on a Marxist analysis of the fall of the USSR which goes into detail on how Gorbachev's misjudgements and revisionism in particular was the last sledgehammer needed to Soviet Russia's columns. Other uploads on the channel are pretty quality too, even if written by liberal investigative journalists who draw the wrong conclusions but pretty thoroughly break the subject down ('Poisoner in Chief', and 'The Pentagon's Brain'). Also make sure to check the description to give the original reader some credit.