Which is it? Did the Russians hack the DNC or is it "fake news and propaganda"? You cannot have it both ways. (Relevant paragraph from link in explanation box.). Btw, the US has been spreading propganda and interfering in elections worldwide for decades.
From the article:
Tracking disinformation online is challenging because it can be hard to discern users’ motivations and affiliations. But congressional investigators probing Russia’s interference in the 2016 election are interested in how social networks spread fake news and propaganda, such as documents stolen by Russian hackers from the Democratic National Committee and Hillary Clinton’s campaign chairman.