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Why was Pierre-Joseph Proudhon imprisoned in 1849?

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Red anarchy symbol, a capital letter A inside a circle, painted with rough brush strokes on a white background. — anarchism The “circle-A,” a common anarchist symbol.

Pierre-Joseph Proudhon was imprisoned in 1849 primarily for his vocal criticism of Louis-Napoleon, who served as the president of the Second Republic before declaring himself Emperor Napoleon III.1

During the revolutionary period of 1848 and 1849, Proudhon edited several periodicals that were frequently suppressed by government censorship. While he served as a member of the Constituent Assembly, he used his platform to challenge the rising authoritarian tendencies that eventually led to the dictatorship of Napoleon III. Following his imprisonment in 1849, he remained incarcerated until 1852.1