tldr: the cia and state department are legally required to share what they've done in the past 25 to 40 years and the stuff they've released so far shows a well documented history of the american government giving weapons, money, mercenaries, etc. to any organization that is the self declared enemy of a progressive movement that's going left.

in this context, it means that they're referring the parts where the cia gave money to italian and spanish letists -- anarchists in this case -- that caused political violence in western europe to prevent their governments and people from becoming "too progressive".