RussiaGate was generated by the DNC as a post-hoc justification of their loss to Donald Trump. Most people on the left bought into it. The org central to manufacturing the narrative was Hamilton 68, which was a creation of the think tank "The Alliance for Securing Democracy". It had both Democrats and Republicans on the board, including Neocons like Bill Kristol.

https://securingdemocracy.gmfus.org/hamilton-68/

Noam Chomsky made one of the more enlightening statements on RussiaGate:

https://www.democracynow.org/2018/7/27/noam_chomsky_on_mass_...