As they are both paramilitary coups that strong arm the organs of the state into line with the new revolutionary party. The big difference is of course in the acquiesence (or not) of the existing elites, but there are enough similarities that I get why fascism was originally seen by many as leftist

Another thing I found fascinating in LOTT is basically Lenin doing a one-man coup within the Bolsheviks when he got back to Petrograd. There was a lot of disagreement over whether they should cooperate with the Provisional Government, continuing the war against Germany. Lenin steamrolled opposition