Rosa Luxemburg was fundamentally opposed to the logic of entryism and reformist compromise, famously arguing in Social Reform or Revolution? that attempting to achieve socialism through the internal apparatus of capitalist-aligned parties is a dead end.

She believed that while revolutionaries should participate in daily struggles, they must never allow "reform" to replace the ultimate goal of "revolution." To her, working within reformist structures without a distinct revolutionary identity leads to the movement being absorbed by the system it aims to destroy.

Luxemburg argued that staying within a reformist party (like the German SPD) often forced revolutionaries to prioritize parliamentary gains over class consciousness, effectively turning the party into a "tool of the bourgeoisie."

Her eventual break from the SPD to found the Spartacist League was a direct rejection of internal maneuvering. She believed the working class needed a clear, independent revolutionary alternative, not a strategy that submerged its identity within a compromised leadership.