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In 1865, Pierre-Joseph Proudhon, the influential French philosopher and economist, passed away. He is known for his critical analysis of capitalism and advocacy for social justice. Proudhon's seminal works, such as "What Is Property?" and "System of Economic Contradictions," challenged the prevailing economic and political systems of his time. His ideas continue to impact social and economic thought, contributing to ongoing debates on anarchism, mutualism, and the nature of property.