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 "Deutsche Jahrbuecber." By this time he had become a revolutionary, and in the following year he incurred the hostility of the Saxon Government. This led him to go to Switzerland, where he came in contact with a group of German Communists, but, as the Swiss police importuned him and the Russian Government demanded his return, he removed to Paris, where he remained from 1843 to 1847. These years in Paris were important in the formation of his outlook and opinions. He became acquainted with Proudhon, who exercised a considerable influence on him; also with George Sand and many other well-known people. It was in Paris that he first made the acquaintance of Marx and Engels, with whom he was to carry on a lifelong battle. At a much later period, in 1871, he gave the following account of his relations with Marx at this time:—