——Was MI6 also meddling?-——
In the absence of definitive prooof........ no
Select individuals in the American FBI or CIA or DOJ recruited selecte individuals in MI6 to perform certain tasks out of school so to speak to remove American fingerprints.
Neither the “American Government” nor “MI 6” was officially involved
My thoughts on the matter
My thoughts are that of course they both were—which is what they are still trying to keep hidden. Guys like Halper were actually operatives for both and certainly paid handsomely by the US through the election cycle. Whatever the else for?
The claim to wanting to keep sources and methods hidden is presumably precisely based on all the official requests for Five Eyes spying, etc., with the argument being that the British operatives who carried out the requests shouldn’t be exposed — or we can’t expect any cooperation from them or others like them in the future.