It seems very similar to Trotsky's transitional program. However the resources I've found online explaining it have been few and short, so I'm still confused how mass line actually works in practice. It seems like a fantastic tactic for the left to deploy right now, but I haven't found any resources that explain it in detail.
It is a way of obscuring the inherently anti-communist dichotomy between "masses" and a hierarchical party structure which is separate from society which produces it.
Third positionism but for self-described communists
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dumb