To expand a bit on my question: Are there any records of the MI6 (and/or other entities, e.g. the CIA or NATO), in connection to their role in this period of civil unrest in Italy?

I'm aware that Western and Soviet governments influencing politics in foreign countries was just business as usual during the Cold War (and beyond).
The reason I ask this is that I noticed the MI6 being listed, on Wikipedia, as a supporter of the right-wing side of the conflict, listed among Italian organizations that are pretty shady, to say the least. But I couldn't find anything online to support this entry on Wikipedia. The entry's annotation is just this relatively obscure information, with no references: "Writer's name 'leaked' to NF". The Guardian. 1990-01-31."

Will appreciate any replies shedding some light on this, and the post-WWII Italian troubles and how the Western powers involved themselves.