Why was Karl Marx expelled from Paris?

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Karl Marx was expelled from Paris in February 1845 due to the intervention of the Prussian government, which pressured French authorities to take action against him.1

During his time in Paris, Marx had become a revolutionary and a communist, associating with various working-class societies and publishing radical critiques, such as his assertion that religion is the "opium of the people". Following his expulsion, he moved to Brussels, where he was joined by his collaborator Friedrich Engels.1