Level
2
Longer
Short
Betrayers of socialism from within the workers. These people are proletarians like you and me, but they advocate for the bourgeoise.
Who spoke about it
The masked opportunists, the Kautskyites, are much more harmful and dangerous to the labor movement, because they hide their advocacy of alliance with the former under a cloak of plausible, pseudo-“Marxist” catchwords and pacifist slogans. The Military Programme of the Proletarian Revolution