Karl Marx’s Capital draws a famous line: the distinction between the sphere of circulation (where freedom, equality, and contract reign) and the hidden abode of production (where exploitation occurs). This boundary was revolutionary. However, subsequent Marxist orthodoxy drew additional, often unacknowledged, boundaries: between productive and unproductive labor, between the economic base and the cultural superstructure, and between the waged proletariat and the unwaged. The theorist we call Emma Marx argues that these boundaries have become epistemic fences, excluding whole terrains of struggle—domestic labor, ecological degradation, racialized dispossession—from the core of revolutionary theory.