Past and present currents and movements commonly described as libertarian socialist include anarchism (especially anarchist schools of thought such as anarcho-communism, anarcho-syndicalism collectivist anarchism, green anarchism, individualist anarchism, mutualism and social anarchism) as well as Communalism, some forms of democratic socialism, eco-socialism, guild socialism, libertarian Marxist (especially autonomism, council communism, De Leonism, left communism, Luxemburgism and workerism), various traditions of market socialism, several New Left schools of thought, participism, revolutionary syndicalism and some versions of utopian socialism. Despite libertarian socialist opposition to Fabianism and modern social democracy, both have been considered as part of the libertarian left alongside other decentralist socialists.