Emphasis on one of though, it wasn't like they just dropped a bomb and left. There were other groups involved.

This

https://en.m.wikipedia.org/wiki/Links_between_Trump_associat...

And

https://en.m.wikipedia.org/wiki/Russian_interference_in_the_...

are fairly good articles last time I checked.

I kind of subscribe to the "OSINT groups are led on by state intelligence agencies" theory, but that doesn't mean they're wrong.