Social anarchism, also known as left-wing anarchism or socialist anarchism, is an anarchist tradition that sees individual liberty and social solidarity as interlinked.
Mikhail Bakunin, founding figure of collectivist anarchism
Peter Kropotkin, founding figure of communist anarchism
The social anarchist Murray Bookchin, who contrasted the tendency against individualist anarchism and claimed there to be an "unbridgeable chasm" that separated the two.
Mikhail Alexandrovich Bakunin was a Russian revolutionary anarchist and political philosopher. He is among the most influential figures of anarchism and a major figure in the revolutionary socialist,
Social anarchism
…non-hierarchical forms of social organization, such as networks of popular assemblies and worker cooperatives. Identified with the socialist tradition of Mikhail Bakunin and Peter Kropotkin, social anarchism is often contrasted with individualist anarchism. Social anarchism is opposed to all forms of hierarchical power…
Bakunin in 1862, photograph by Nadar
Antonia and Mikhail Bakunin, c. 1861