From this thread:

I would consider National Bolshevism as more of a right wing ideology since it is not internationalist as opposed to Marxism Leninism (where there in fact exists nationalism, for example Ho Chi Minh was one, but it is combined with internationalism). National Anarchism is simply one of the stupidest things it could exist, since anarchism is a proponent of a stateless society therefore it is contradictory to its roots; it can be considered as much anarchist as Anarcho Capitalism.

Basically, Marxism Leninism can be nationalist and left wing at the same time.