Final answer:
Pierre-Joseph Proudhon said that equality among men would not be achieved until property was abolished.
Step-by-step explanation:
Pierre-Joseph Proudhon said, "equality among men would not be achieved until property was abolished." In his book "What Is Property?", Proudhon argued that ownership of property was a form of theft and that individuals should only own what they personally produced or earned. He believed in a system of mutualism, where individuals and cooperative groups would exchange products based on mutually satisfactory contracts.