A ring is more reliable in uniting the extremists -- the people ambiguous on whether they are communists of fascists because they have the worst features of both. Think of the Strasser brothers in Germany who wanted the emphasis on socialism or of National Bolsheviks. The extremists are similar in their regimentation, terror, brutality, and contempt for democratic norms. North Korea is a prime example.
Take Laurence Britt's infamous list of 14 warning signs of fascism, and some hyper-Red regimes fit well.
The Strassers weren't socialist in any meaningful sense. I know that they, as well as the SA, tend to be portrayed as some "left-wing" of the NSDAP, but their platforms bear little resemblance to the broad left-wing ideologies of the day in general, and certainly not to Marxism in the particular.
Germany Tomorrow or
Structure of German Socialism is much closer to
Mein Kampf than it is to Marx's
Capital in it's analysis and agenda. The Strassers, although often co-opting Marxist rhetoric and terminology, are fundamentally anti-materialist in their worldview as demonstrated by their writings.
To be completely honest I know next to nothing about Dugin or the National Bolshevik movement in Russia, so I can't really comment on whether or not they represent a true synthesis of the far-right and far-left. But if they are anything like their counterparts in Germany, then the ideology is little more than a far-right bastardization of socialism with a thin veneer of Marxist terminology and aesthetics.