@b870d4c8 Also worth noting is the type of left we're talking of.

I mean, I wouldn't put your average marxist, anarchist or socdem in the same bracket as maoists, stalinists, trotskyists and other authcoms.

But still, sometimes it seems like authoritarians are seemingly eager to work towards common goals, even if their underlying ideologies are supposedly antithetical to one another. 

 @288794a9 yes, I think you're right that authoritarianism is the common factor here.