Looking for best Non-Leninist critiques of class struggle anarchism?

Submitted by klas batalo on November 7, 2016

What the title says. I'm interested in critiques of historical movements of the 20th century or earlier. If it's from Marxists I prefer well researched and non-Leninist. Usual Trot stuff are just poor. Also interested in any internal type critiques by anarchists for anarchists. :D