 Between early 1845 and early 1848, Marx lived in Brussels, the capital of a rapidly industrialising Belgium. A condition of his residency was to refrain from publishing on contemporary politics, and he was eventually expelled after political demonstrations involving foreign nationals took place. In Brussels Marx published The Holy Family (1845), which includes contributions from his new friend and close collaborator Friedrich Engels (1820–1895), continuing the attack on Bruno Bauer and his followers. Marx also worked, with Engels, on a series of manuscripts now usually known as The German Ideology (1845–46), a substantial section of which criticises the work of Max Stirner (1806–1856). Marx also wrote and published The Poverty of Philosophy (1847) which disparages the social theory of Pierre-Joseph Proudhon (1809–1865). All these publications characteristically show Marx developing and promoting his own views through fierce critical attacks on contemporaries, often better-known and more established than himself.