Individualist anarchists reject even the loose cooperative structures that other anarchists favor, lest they harden into a permanent government or authority. Mutualist anarchists, like Proudhon (1809-1865), aimed to establish communal banks through which people could exchange products and labor, eliminating all state and capitalist institutions. Collectivist anarchists, the Russian philosopher Mikhail Bakunin (1814-1876) foremost among them, sought to abolish private property altogether. Peter Kropotkin (1842-1921) built on Bakunin to advocate Communist anarchism, which, like classical Marxism, taught that as society evolved the state would wither away, leaving workers free. Syndicalist anarchism saw trade unions filling the place of government, and often championed violence in the service of its end. Finally, pacifist anarchists, such as Leo Tolstoy, renounced violence and revolution as destructive of the ends they sought. Individual anarchists might subscribe to more than one of these branches at different points in their life—or even at a single point.