Peter Kropotkin in the context of "Orography"

Murray Bookchin (/ˈbʊktʃɪn/; January 14, 1921 – July 30, 2006) was an American social theorist, author, orator, historian, and political philosopher. Influenced by G. W. F. Hegel, Karl Marx, and Peter Kropotkin, he was a pioneer in the environmental movement. Bookchin formulated and developed the theory of social ecology and urban planning within anarchist, libertarian socialist, and ecological thought. He was the author of two dozen books covering topics in politics, philosophy, history, urban affairs, and social ecology. Among the most important were Our Synthetic Environment (1962), Post-Scarcity Anarchism (1971), The Ecology of Freedom (1982), and Urbanization Without Cities (1987). In the late 1990s, he became disenchanted with what he saw as an increasingly apolitical "lifestylism" of the contemporary anarchist movement, stopped referring to himself as an anarchist, and founded his own libertarian socialist ideology called "communalism", which seeks to reconcile and expand Marxist, syndicalist, and anarchist thought.

Bookchin was a prominent anti-capitalist, anti-fascist and advocate of social decentralization along ecological and democratic lines. His ideas have influenced social movements since the 1960s, including the New Left, the anti-nuclear movement, the anti-globalization movement, Occupy Wall Street, and the democratic confederalism of the Democratic Autonomous Administration of North and East Syria. He was a central figure in the American green movement. An autodidact who never attended college, he is considered to be one of the most important left theorists of the twentieth century.

Anarchist communism is a far-left political ideology and anarchist school of thought that advocates a form of stateless communism. It calls for the abolition of private real property but retention of personal property and collectively-owned items, goods, and services. It supports social ownership of property and the distribution of resources (i.e. from each according to his ability, to each according to his needs).

Anarchist communism was first formulated as such in the Italian section of the International Workingmen's Association. The theoretical work of Peter Kropotkin took importance later as it expanded and developed pro-organizationalist and insurrectionary anti-organizationalist section. Examples of anarchist communist societies are the anarchist territories of the Makhnovshchina during the Russian Revolution, and those of the Spanish Revolution, most notably revolutionary Catalonia.

The Russian nihilist movement was a philosophical, cultural, and revolutionary movement in the Russian Empire during the late 19th and early 20th centuries, from which the broader philosophy of nihilism originated. In Russian, the word nigilizm (Russian: нигилизм; meaning 'nihilism', from Latin nihil 'nothing') came to represent the movement's unremitting attacks on morality, religion, and traditional society. Even as it was yet unnamed, the movement arose from a generation of young radicals disillusioned with the social reformers of the past, and from a growing divide between the old aristocratic intellectuals and the new radical intelligentsia.

Russian anarchist Peter Kropotkin, as stated in the Encyclopædia Britannica, "defined nihilism as the symbol of struggle against all forms of tyranny, hypocrisy, and artificiality and for individual freedom." As only an early form of nihilist philosophy, Russian nihilism saw all the morality, philosophy, religion, aesthetics, and social institutions which were in place as worthless and meaningless but did not necessarily see meaninglessness in all ethics, knowledge, and human life. It did however, incorporate theories of hard determinism, atheism, materialism, positivism, and egoism in an aim to assimilate and distinctively recontextualize core elements of the Age of Enlightenment into Russia while dropping the Westernizer approach of the previous generation. Russian nihilism developed an atmosphere of extreme moral scepticism, at times praising outright selfishness and championing those who held themselves exempt from all moral authority. In its most complete forms it also denied the possibility of common ideals, instead favouring a relativist and individualistic outlook. Nihilists predictably fell into conflict with the Russian Orthodox religious authorities, as well as with prevailing family structures and the Tsarist autocracy.

Johann Rudolf Rocker (German: [ˈʁɔkɐ]; March 25, 1873 – September 19, 1958) was a German anarchist writer and activist. He was born in Mainz to an artisan family.

His father died when he was a child, and his mother when he was in his teens, so he spent some time in an orphanage. As a youth he worked as a cabin boy on river boats and was then apprenticed as a typographer. He became involved in trade unionism and joined the Social Democratic Party of Germany (SPD) before coming under the influence of anarchists such as Mikhail Bakunin and Peter Kropotkin. With other libertarian socialist youth, he was expelled from the SPD, and his anarchist activism led to him fleeing Germany for Paris, where he came into contact with syndicalist and anarchist ideas and practices. In 1895, he moved to London. Apart from brief spells in Liverpool and elsewhere, he remained in East London for most of the next two decades, acting a key figure in the Yiddish-language anarchist scene there, including editing the Arbeter Fraynd periodical, publishing the key thinkers of anarchism, and organising strikes in the garment industry. In London, he formed a life partnership with Milly Witkop, a Ukraine-born anarchist from a Jewish background. During World War I, he was interned as an enemy alien and at the end the war he was deported to the Netherlands.